Any good Dungeon/Loot games for the Xbox 360?

Just wondering are their any good ones? I'm getting Castlevania: Harmony of Despair because I like Castlevania series but i'm wondering is their any of these games with a little better graphics. I heard about Dungeon Siege 3 but probably won't be getting it since i've seen too many bad reviews for it. Oh and it needs to be a co-op game.