The Gamecube I would have to say. The only games I actually enjoyed on that console was:
Super Mario Sunshine
The Legend of Zelda: The Wind Waker
Mario Kart: Double Dash!!
Super Smash Bros. Brawl
and I recently picked up Resident Evil: ReMake for the Gamecube. I also want Metal Gear Solid: Twin Snakes for the Gamecube.
It wasn't a bad console, I'm glad to own it. But it didn't stack up like the others.