Almost as over-rated as Halo.
But fun as hell.
Multiplayer blows, didn't like the first one, but the second one was pretty badass. Horde mode is as fun as co-op, and I NEEDED co-op to beat that one reaper boss level.
On another related note, I'd like to mention that the way the game is structured is fantastic, returning to classical roots with the simple Level+Boss formula, and the boss battles are pretty fun.
Plus, the amount of gore is hilarious.