I suck at all these games. I use to be good at the N64 one when it first came out, but this was against my friends who were quite n00bish along with me when playing the game. I don't remember much of the times we played these games (as Pokemon was still quite the popular thing at the time and took up a chunk of my gaming time) but I do remember I won a majority of the matches.
If I played any of these in a tournament today I'd lose quite fast. I went to a Melee tournament a few years back at a local game store with a buddy of mine and I got my ass kicked by 10-year-olds using Link.
As for my favorite character in the games (never played Brawl, and probs really wont) I'd have to say it's always been Captain Falcon. Not sure why, but he was just a fun character to use, and I only played these games for the fun of it.
~ Aether Nexus