Bowling is all I ever seem to play. Mario Kart has it's moments, but I never feel like I have much control.... really conflicts with my ocd
Have you tried using the nun-chuck instead of the wheel? Way more control... I also think it makes the game more fun.
I agree with mario galaxy and mario kart and also add boom blox, zelda twilight princess and super smash bros brawl. If you're into first person shooters id say metroid prime 3 and call of duty world at war.
Super Mario Galaxy nearly ended my marriage. OK not really, but my wife was pretty pissed during the week that I spent obsessively playing it until I had won.