Lost Odyssey, after hearing all the damn hype about it, that and the fact that my friends wouldn't shut up about it, I did something rare and listened to them, I bought the game, expecting it to be something amazing, unfortunatly it just fails to deliver what was promised to me.
Halo 3, campaign is short and the ending is awful, but the multiplayer and Forge makes up for that somewhat, unfortunatly though, like Yahtzee says, I'd rather not be paying for a half decent game.
Devil May Cry 2 and 4, both of these games got a lot of hype, and again I was let down, 2 just sucked, end of story, I finished it once and haven't played it since, 4 had a little bit more going for it, but the fact that Nero is basically a carbon copy of Dante and Vergil just isn't what Capcom promised, a new and refreshing character.