Let-a me see...I have too many favorites (lol), so I'll list my top ones (which, come to think of it, might change, lol):
Super Smash Bros. Brawl (although I DO like the other two as well)
Legend of Zelda (all of them [YES, even Wind Waker] except the CDi ones)
Call of Duty 4: Modern Warfare
Mario Kart
And I think that's about it, I can't remember any others at the moment.