All Zelda games, expect 2. lol
Oblivion - I was just overwhelmed. I don't have that much time to devote to games.
Super Smash Bros Brawl - It feels like a bunch of button mashing to me. I'm sure I'm missing something.
Mario Kart - Too kiddy and the game is cheap (ie last place cars get the best upgrades).
The Gran Turismo series
This is a little off topic, but I've found the Wii to be disappointing. It's just not for me.