Religion tends to be a source of many of the world's conflicts. This applies to even things that aren't necessarily religion itself. Melee is almost seen religiously sometimes. And if seen "religiously", it will always have a higher chance of sparking conflict. This doesn't just apply to Melee though. This could apply to any game; Smash 4 included.
There are several core problems as to why conflict arises in topics such as this. There is no definitive root, but several. So in order to help aid the problem, we need to study each individual root cause, and address it.
1) The competitive scene being seen "religiously".
This usually applies to Melee, but regardless, this is usually the largest problem. Melee was indeed a great game, with a lot of great (though debatable) mechanics. Wavedashing, L-Teching, DJCing, and more. For me? I personally loved them all. I love how Melee was competitive, and how engaging it was for players. But I am not going to see it as an "End-All, Be-All" sort of game. The mechanics of the game weren't intended to be a formula that future sequels were meant to follow. It didn't even start the formula for Smash as a whole; Smash 64 did. A lot of people get confused by that, because the core formula of Smash is that it is meant to be fun. Granted, everyone has their own variation of fun, and it could be argued that Melee was the game that crafted the formula for competitive Smash play. But everyone has to remember that it is still just a game, and the core element of Smash is that it is meant to be fun. Again though, everyone has their own perspective of what fun is. But you have to remember that the competitive aspects of Smash are only secondary to what these games are designed for. And, if a particular game in the series doesn't apply to your ideal of fun? Simply don't play it. Enjoy what you find to be fun, but don't ruin it for other people. Competitive scenes will develop for each game within the series. If a particular scene doesn't appeal to your interests based upon the game it is about (Brawl for example), simply don't partake in conversations there, and give people respect for the game that they love. If you are someone like me, who just loves all Smash games in general, then feel free to join them all. Ultimately though, each game should be enjoyed as its own entity, and not as something formulaic in concerns to something (competitiveness) that is only secondary to the series's true nature.
2) A player's own lack, or refusal, of adaptation.
This is a subsection that branches off from the first main point that I have provided. Every Smash game easily has the potential to be competitive. While the competitiveness of the game is only secondary, it is still every bit as integrated as the first ("fun"). Because the main object of the game is to take the opponent out, by definition of this mechanic alone, every Smash game will ALWAYS have the potential to be competitive. "More competitive", "less competitive" you say? These statements hardly matter, as they are subjective; much like how the perception of "fun" in each Smash game is subjective. Every Smash game is competitive in a different manner, and should be treated as such. So then, what is holding back one game (Brawl) from being as competitive as another game (Melee)? Adaptation. Not everyone is willing to adapt to new experiences, especially if it diverts from something that they already enjoy and are familiar with. Players often lock themselves to a particular game (Melee) if it becomes something that is both enjoyable and familiar to them. This makes them grow to detest, and resent something that they are unfamiliar with (Brawl), or simply just don't find to be fun. And, honestly? There is absolutely nothing wrong with that. People are free to enjoy the things they love, and feel comfortable with. Though players also need to understand that, if something isn't fun or is unfamiliar with them, it is a personal problem. It isn't the game's fault if it isn't enjoyable to you. It is your own fault if a game isn't fun to you. Though, while the aspects of something being "fun" and "competitive" are subjective to the person that perceives it, every Smash game will always have the potential to have those things to those not only willing to just try it, but to try to adapt to each game as well. The main objectives in Smash will always be the same: To have fun, and to win. These two elements are all a game needs in order to be competitive, and they are the only two things that I personally think about whenever I play a Smash game. As a human being, I was born with the ability to adapt. So, while there will always be situations in the future that I am unfamiliar with, that doesn't mean that I should immediately detest and dislike them, but rather I could try to adapt to the situations around me instead. If it still ends up being something that I don't like, then hey, I can always just avoid such topics/situations/etc that don't appeal to my interests. This should apply to Smash players, as well. Try to adapt to something that you are unfamiliar with. And if it still doesn't appeal to you? Simply leave it alone, and just move on.
3) The problematic "Meant for Me" mentality.
Many players, though not everyone, feel as though that Smash games should be made specifically for them. And this is a rather erroneous way of looking at Smash, and the world, in general. The Smash games are designed to appeal to millions of people, each with their own perception of what fun is. I have seen a lot of people bring up the argument "Have you ever tried making a game?". Well, it isn't the actual process of making a game that is hard. With enough time, dedication, and talent; anyone game make a game if they truly wanted to (Project M). That part is easy, and...very irrelevant, to be quite frank. The hard part is that it has to appeal to millions of gamers around the world, and not just one person. Or heck, even a group of individuals (Smashboards). Why is this something that is hard? Because not only does each person have their own perception of what "fun" is; what could be good for another person, could be bad for another person. This applies to everything in life, and this includes Smash as well. Whether it be the game's mechanics, the character roster, the music, the stages, or what-have-you; some person is inevitably going to end up disliking something that another person is going to like. THIS is the hard part when it comes to making games, and additionally, making games is a business first and foremost. It is their job to make money for their company, and they aren't really going to care about a few lost sales so long as they appeal to a large majority of people. Even if we exclude the business aspect though, Sakurai is trying to appeal to as many people as possible. And that is something that is truly respectable. So while he might not always have the best ideas to try to go about this (*coughtrippingcough*), but it is what he wishes to accomplish. Is what he perceives, or what he creates a good thing? That is for you to decide. But remember that the game isn't meant just for you, it is meant for everyone. This includes Sakurai as well. As his own creation, I wish for his own satisfaction with what he does with the game. It is part of his life's work, after all. And what he has brought us thus far, I sincerely enjoy. Does that mean that he should remove mechanics from Melee, since they really don't harm casual players? It doesn't really matter, because that isn't our decision. It is his decision. If he removes such elements from future games because he feels as though it interrupts the overall balance of the game? Then hey, that is his own perception of his own creation as a whole. And he has every right to do such things. That doesn't stop the games that he creates from being fun, or competitive. We do that to ourselves. Even so, he has shown that he is still trying to cater to us, as well as everyone else. Combos are back, the game is faster overall, tripping is gone, and several characters are getting balanced to try to make them more competitive (Bowser). But even though we got these changes, Smash is meant to be enjoyed by everyone. Even though we are a portion of the entire consumer-base, we shouldn't feel as though that the game is meant for us, and that Sakurai should make the game to cater to our own needs. It is up to him how he makes his own game; and it is up to up to decide whether or not we enjoy the product he creates. Simple as that. If we don't like it, then hey, there are plenty of other things to enjoy in life. Or in this instance, a large variety of other Smash games that we could choose from (64/Melee/Brawl/Brawl+/Balanced Brawl/Brawl Minus/Project M). We have options to cater to our own needs, and that is what matters.
4) Mind over Mechanics.
Wavedashing, L-Techning, DJCing, DACUSing, Glide Tossing, and more; I love all of these mechanics. Are they necessary to win a match? Sure. In several instances, you might need these techniques in order to have an edge over your opponent. But are they necessary to make a game competitive, let alone good? No, not really. As much as I love all of those things, a player's own mind will always be the definitive edge that they can have against their opponents, and what will make games competitive. Just because they were present in previous Smash games, doesn't necessarily mean that they are necessary to make Smash 4 competitive or fun for players. We already have what it takes to accomplish that. Experience, and learning are always going to be tools at our disposal when it comes to competitive play. Spacing, reading your opponents, practice, improving offense and defense, adapting to new situations and challenges, timing your moves; these techniques are what make Smash games truly competitive. We only abused Wavedashing, L-Teching, and etc because they were available to us at the time. But it was our mind that made them available to us in the first place. If players can adapt to a game in which these elements were present (Melee/Brawl), players can still just as easily adapt to a game without such elements (Smash 4) in due time. We may even discover even more advanced techniques in Smash 4 whenever it comes out, who knows? But it is our own minds that make the games we play competitive; learning the mechanics of the game is only secondary. But the mechanics themselves aren't necessary to playing the game. You adapt, you beat your opponent, and you win. Those are the basic rules to almost every single competitive game in the world, and Smash is no exception to this rule.
5) People are a mixture, not a solution.
People will be people. We will always have our differences with eachother. We will find things other people say to be agreeable, or other times, we can hate their guts. But people will always have their own likes, dislikes, hopes, fears, thoughts, and feelings. And we should always try to be mindful, and respectful towards other people as long as they don't give us a true warranted reason to hate them. Always remember that the things you say to somebody online, you aren't saying to a robot. You are talking to human beings, and you should always try to treat them as such. People are always going to have their differences, though people can always work them out as long as they try. Though there will never be a true solution, because of how complex people are. Much like people, Smash is going to be the same way. Each new game is going to have their own differences that we are either going to like, or dislike. But Smash games don't have feelings, like people do. So talking to other people in a respectful manner should always take precedence over talking about the game itself. So, regardless of your love for Smash, you aren't the only one. And we are all here for the same reason. Sure, we all perceive it in our own ways, but mostly all of us love Smash Brothers in one way or another. So regardless of our differences, we all aren't as different as you think. So remember to treat others, as you would treat yourself. This won't always form a true solution, but a compromise that can benefit both parties. It's funny that I mention that, because from what I have seen of Smash 4, that is how I feel the game is going to turn out to be. For both casual, and competitive players. So while a true unity/solution may never be reached, it is better to have good experiences to share with the people around you than bad ones. So, don't just try to make things enjoyable for yourself, but for other people as well. And this is a community that's full of people that love Smash. So always be mindful, and respectful towards them; and they will be more likely to do the same for you, too. Be it Smash 64, Melee, Brawl, Project M, Smash 4, or whatever variation of Smash; we are all here to have fun with the game we love. So while the perception of fun will always be different, it is still a universal feeling that can be felt by all of us.
If we take these five points into consideration, I am sure that we can all make a better community. Not just for ourselves, but everyone here. I may have not worded these things the best, but hey, I'm only human. And those are my thoughts/feelings in regards to this topic.