New take on the Diablo style game.
While it does have a fairly week story, the game satisfies the treasure hunter in all of us. The Diablo style game play and FPS style interface, merge into one happy union, satisfying two different genres.
Single player is fun, but the real fun comes in co-op. The game allows up to 4 players, while appropriately scaling the difficulty of the enemies. This makes the co-ops fun and challenging, especially when trying to find the unique ways to utilizes the different characters strengths to you advantage.
Over all the game gets an A from me, and if you like a new take on a dungeon crawl, I'd look into this one.