Why isn't Resident Evil 4 in that poll?
Sure, it was ported to the PS2 and the Wii, but back when it was gamecube-exclusive, RE4 was the one game I could always go back to and play over and over without getting tired of it.
Wind Waker was nice, but I don't share the same enthusiasm as most other people. Its atmosphere was way too lighthearted for me, especially the soundtrack. I preferred Ocarina of Time and A Link to the Past for their more serious tones and epic-feeling soundtracks, the latter of which did a nice job for such an old system.