Brawl is just a better game that's more fun. I played Melee for like 5 hours straight last weekend (because my friend's copy of Brawl was broken) and I was like "Wow, I really miss Brawl."
I'm not some hipster who thinks that only the older games are better or some idiot who thinks Super Smash Bros. is a highly competitive and balanced fighting game.
It's more fast paced, and still having the controls being able to respond when pressing buttons that fast, makes for a better game IMO. Brawl is good, the only things I hate about it are the insanely long load times, the single player, Final Smash's, and the pace, it's waaaay too slow for my liking. When I jump with Link (my main), I don't like to float in the air for a little bit in Brawl. Also, just for liking older games, doesn't make anyone a hipster lol. That word gets thrown around too much it's lost all meaning.