It was pretty short, there was quite a bit of cinematics but I still enjoyed it. I think it went by fast because I left the difficulty at normal, if you turn it up I'm sure it would take longer. I went back and started from the beginning since I picked up where my roommate left off and realized he only played through 2 levels...definitely made me feel like a nerd
h34r:
Personally if you like campaigns more than multiplayer I'd say try and rent it and see how you feel about it before you drop 60 bucks. The part I haven't messed with yet is the Special Ops, You can play solo, split screen or online and go through other missions outside of the campaign like 'survival' and what not. We rented it but I still might buy it, the online stuff is growing on me.