I think the biggest letdowns for me were the original Fable and (I'm going to get flamed to hell for this) Mario Kart Wii.
Fable is a perfect example of a game where the hype went overboard and the game itself couldn't match.
Mario Kart Wii, mainly because the races are now item and luck based more so than skill based, and I'm sick of going from first to ninth mid-lap on the third lap all the time.







