Melee had several mistakes. An abundance of glitches, and as did brawl. The main difference being the glitches in Melee made the game what it is now. It's a game that uses exploits to become fast and active. Brawl has several exploits but the over all game is slow and boring.
Brawl is a game where you play the top tiers, everyone else is practically useless. I wish I had a losing chance in brawl when using Meta Knight. In Melee I can definitely lose even when playing Fox because in Melee there are less characters over all. They cared more about each and their move set (expect Kirby and Pichu.) In Brawl they gave up all hope on an active game and proportionally 90% pf the characters are utterly useless.
I love Melee because it's playable and fun. I can love it if I am new or competitive. I wont just win if I play Fox, he requires skill.
I dislike Brawl because it only fun if you haven't played Melee. I will win if I play Meta Knight. ZSS, and Diddy Kong.
NOW SMASH 4 is like woah, because it took all of the mistakes Brawl made and fixed em', Why play Brawl. I have Smash 4. It's a more balanced game, it has an online mode that works (kinda), it fixes all the mechanics. I have no reason to play Brawl.