I guess it depends what types of games you're into really. A couple of great games got released just yesterday, they didn't get great reviews, but then they are fantastic games imho
Fuel - superb game, look past the initial graphical shortfalls and give the game a chance to grab you with it's huge explorable world, fantastic handling and fun racing. I've been really surprised at how good this game is given the negative reviews, easily my favourite offroad racer in years. In a strange way it reminds me of fallout 3, it's almost like fallout but with cars and buggies. I can spend hours just driving around in freeroam looking for things.
Sacred 2 - Got this on PC and I'm surprised how well it translates over to consoles. The 360 version is great, looks just as good as the PC version (which isn't that great, but then this is an Action RPG). If your a fan of old school Diablo style gameplay, levelling up characters, collecting lots of loot, experimenting with different character builds and skills etc, then this is another really good game.