The Gamecube is bloody amazing, if only for the simple fact LOZ: Wind Waker was released on it. Ocarina of Time: Master Quest also sealed the deal for me.
I love all the upgrades they did on older N64 games for GC. Mario Kart Double Dash and SSBM just to name a couple. It was all the classics, improved not destroyed with much nicer graphics and longer plots etc. Plus, the shape of the console itself shits all over the other consoles at the time :p.
Gamecube games are so hard to find though... and I'll admit while some of the games are amazing, the rest of the limited selection aint that great. Still worth having though imo, especially since I can't afford a Wii... and I didn't quite see it before I added to dictionary, but I swear Firefox just tried to change Wii to wienie. My life is complete.