I owned all three of the last generation home consoles (and a GameBoy Advance), and I played my GameCube far and away more than my PS2 or Xbox. I actually buy very few multi-platform games, and when I got them I got them on GameCube because I liked the controller the most and it had the shortest load times.
I actually tend to buy very few poor quality games, and as such my gaming library is pretty small, but I get a lot of mileage out of a game if I buy it. If you look at my games they're almost all exclusive to their respective platforms.
I played my Xbox the least, and right now it's sitting on the floor quite literally under a layer of dust. Most of this is probably because I thought Halo 2 was at best a decent game, and I didn't have Xbox Live because I didn't get a credit card until after I graduated high school.
I bought my PS2 for one reason only, and that was DDR. I ended up getting Battlefield 2 for it and an online adapter for free (which was great) and I spent a lot of time online with that. But other than DDR and Battlefield I haven't been able to find any games I really like on it. I've played some of the "greats" like God of War (I found it repetitive. Truth be told, I don't really even like the old 2D Mario games that much and I've never played Mario 64 for fear of the same reason, but Mario Sunshine changed my mind about Mario games.) and Shadow of the Colossus (I wrote a thread on my complaints with that) and nothing on the PS2 has ever really enticed me to play it. I've gone to Gamestop a couple of times before looking for a PS2 game to play and walking out with nothing. I'm trying to borrow a copy of Kingdom Hearts to see if it's all it's cracked up to be, but I like strategy RPG's a lot more and, IMO, no other RPG will be as good as Super Mario RPG.
My GameCube on the other hand, I found that I could always sit down and play. Since 2003, at least once a year I've sat down and beaten WindWaker, when friends come over we STILL play Smash Bros., I beat both of the Metroids a couple of times, which are now the only FPS's who's console controls don't bother me after getting a Wii. Add to that the fun from Resident Evil 4 and SSX3 (which I can honestly say I've logged far over 100 hours on) and I've had tons of fun with the Cube. I really did think it was the best console, but to each their own I guess.
The GameCube (and DDR) were the only game experiences that could tear me from Battlefield Vietnam last gen. I hardly think that the PS2's success was a fluke, but I have had a very hard time finding games that even look interesting on it.
