Not liking a game because it's old or inferior... that's sad. I'm all for playing older games. I got into a lot of franchises that way, the most obvious one being The Legend of Zelda games (Ocarina of Time was the culprit). I also still play Spyro the Dragon (up until the third one, the series went downhill after that), Sonic games, which I prefer the Mega-Drive and Adventure ones, I prefer Pokemon Silver to Pokemon Sapphire too, with Pokemon Diamond somewhere inbetween. It seems that the classics out do the sequels in most of these cases!
As in the Smashing sense, I will still play Melee after I get Brawl, because it's still a great game and I can play as Mewtwo still...!
It'll probably take a long time until I get tired of Brawl though... a very long time. That is, when it comes out over here in the UK.