i play call of duty alot. just got black ops. also batman arkham asylum, dragon age origins and crackdown 2. Crackdown 2 is also online multiplayer. Black ops has zombies mode.
Batman AA is a great game. Arkham City is coming out in late 2011. The trailer is awesome:
YouTube - Batman: Arkham City 'Hugo Strange Trailer' TRUE-HD QUALITY
DAO and COD are both good as well.