The issue with debates about what makes a game "fun" is that pretty much everyone has different opinions about what makes a game fun.
In the ROB social we've been discussing why we like/dislike certain generations of pokemon and how it decides whether or not we'll play the games. Sure, gen 2 is my favorite overall, and sure, I think some of the pokemon designs in 5th gen were dumb, but I'll still play the series pretty religiously because I play it more for the experience and less for the pokemon. I also have a lot of respect for Sugimori and GameFreak for being able to keep coming up with new pokemon after 17 years.
Just like Pokemon, I find the concept of Smash in and of itself to be fun, so I like all three games (and would probably play 64 more if I actually had it) and enjoy them fairly equally. I tend to play Brawl more because there's a less drastic skill gap between me and the higher-level brawl players in my region, whereas with the Melee players I have a lot of difficulty competing most of the time. There's also the fact that none of the people in my town like playing Melee and would rather play Brawl, so I have nobody to play with.
I have difficulty adjusting to the "traditional" fighting games (street fighter, MvC, etc) because I don't find them anywhere near as fun as Smash due to how limited movement is. Similarly, I enjoy Dissidia because you have free range of movement in all 3 dimensions.
The main thing you seem to be forgetting is that Sakurai didn't make Smash for it to be a fighting game, like people do nowadays with traditional fighting games. He wanted to make a fun game with multiplayer where you could have Mario and Pikachu and Kirby and Link duke it out on a bunch of different stages. If he had made Melee to be the super competitive game it is today, he would've left out a bunch of stages and removed the items. Same thing with Brawl. When he added tripping, he was probably thinking it would be a funny little random mechanic that'd make people laugh or get frustrated when it happens; it's no different from an item spawning closer to one person than another, aside from the fact that you can't turn it off like you can with items.
The problem with Melee/Brawl debates is that it's 4 years into Brawl's lifespan and they're still going on. You were disappointed that in your opinion Brawl didn't live up to Melee's "standards"? Then keep playing Melee. Nobody's stopping you. The only things you're doing by bashing Brawl and acting like a melee-elitist are making a bad name for yourself and wasting everyone's time. When was the last time you saw Brawl players walking into the Melee boards and bashing it for being too focused on tech skill?