Mario Kart Wii (Bikes? Uggghhh...). I totally agree with Cactus' opinion on this one.
Nah, for real: Super Smash Bros. Brawl. I can't believe they changed the engine so much... It's definitely for the worse. Same gravity for every characters? No L-cancel (it was even there in the N64 version so don't tell me it's a damn glitch)? No wave dash (it added a whole new level of strategy, even for a glitch)? The Perfect Shield is so easy to perform? Where are these mostly noticeable ''veteran advantages'' against newcomers now? Also, I hate Smash spammers to death, especially Lucas users that can't do other shit than spam that Up+A Smash. It did have a decent single player game (that didn't look like a Smash game, which is good in a way) and an awesome soundtack though.
For real, I hate it because they made Ganondorf change from best character in Melee to worst in Brawl! ;___;