It's fun, I like it. I wouldn't pay $60 for it though (Friend of mine buys a lot of games and lets me use his steam account)
Performance is an issue though. I get
As you can see my quad core is not even being used.
http://img59.imageshack.us/img59/1732/shippingpcstormgame2011.jpg
Per core CPU usage is 45%, 19%, 6%, 16%. GPU is 75%.
However it is a fun game, it's different and not like some other games that try to copy MW2.