The original Smash Bros. just got boring after a while. Melee on the other hand, is a work of art. I've had it since December, and I still play my friends almost daily. I'd like to see Rare do a game using the same engine, only with Rare licensed characters instead. THAT would be badass.
I've actually been using Pichu a lot to piss my friends off. Being beaten by the lightest character in the game (and one that also hurts HIMSELF every time he uses an electrical attack) is a pretty humiliating experience.
My friend Ben uses Roy almost exclusively. It drives me nuts when people do that. My younger brother uses Shiek, and ONLY Shiek. My friend Austin uses only Falco, and my friend Richie uses only Ganondorf. I prefer to have four or five characters that I cycle between.