The GameCube. Didn't care for a lot of the first party games, just didn't click with me. Only thing that redeems it are Double Dash, Melee, and all the mainline RE's up to 4.
Star Wars Rogue Squadron 2 was an awesome launch game. Also, enjoyed the first two Super Monkey Balls (after those two I stopped buying games in the series). Luigi's Mansion was nice but not everyone's cup of tea. Burnout 2 was a pretty bad ass game on GC. Animal Crossing got its western release on the GC which even had about 10 or so NES games that you could play). Oh and it also had a game that was on PS2 called... Ikaruga.