Oh really? I turned it all the way down to even get it halfway usable, the default practically had my heartbeat flinging the aimer around the screen. That might have to do with my high dpi mouse or changing the resolution to max size, though. Never had any problems with other games like that though.
I've read in various posts/blogs that the game is a buggy piece of shit and is average at best, but so far I haven't had any bugs and I'd give the gameplay so far a solid 7/10 where CoD:MW2 would be like a 9/10.