mk should definitly be banned for the sake of brawl's future imo.
In a few months from now probably half of the competitive brawl players will use mk, because they cannot figure out how to beat them. This will greatly take away the fun factor and versatility in the game (and can even result in the game's decrease in popularity.) No, I do not think mk is impossible to beat. Looking at things from a realistic perspective, of course mk is beatable. for example, nynjalink beat m2k at Esticle. But does that mean nynjalink will beat m2k in majority of the sets they play in? absolutely not. although m2k is truly better than nynjalink, I have seen great players fall victim to novice mks. This is part of the reason why I think mk should be banned. I mean lets face it, in melee, regardless of what character you used, if one player is better than the other ( the separation in skill level is evident), then, chances are, they are going to win. I know this because I've been to several melee tournies and the people that were expected to place high placed high regardless of their character. At the same time, I see a bunch of random mk players placing high at brawl tournies. Even though I do not think it is entirely neccessary to compare brawl and melee (given that thy're 2 different games), I do believe that all fighting games should have a fair balance. one would be ignorant to say that mk does not have a huge advantage over every character in the game, and is at a much higher level than all of the other characters. In brawl, sometimes the better players will lose to a lower level player simply bc of the fact that the lower player is using mk and is already coming into the match with a huge advantage. And I really don't consider that fair. Ultimately, MK is becoming ever more powerful (with new strategies, etc.) as well as popular, and this could lead to brawl's downfall. As I mentioned earlier, the game will lack versatility and fun factor if half of the people who played the game used the same character.
And one can ask....if mk is banned then won't everyone just start using snake? Although snake is a great character, as are the other top tiers, he and other top tiers have their evident counters ( so even though they may be some commonly used characters, it won't even be close to the amount of competitive players using mk.) It is very hard to say even months after the game's release that any character has an evident advantage over mk. The other characters aren't as user friendly as mk imo, and thus it is more often that the better player will stand out when matchup up with other top tiers (athough this is not true all of the time.) But, given that, I believe banning mk will still bring more balance in brawl, even if great characters like snake nd g and w were to still be playable.