Idk, I had cod4 for computer long ago and liked it, but it felt rather different on xbox. I didn't like COD5 as it was run and gun most of the time on MP. I am an original COD nut and they are nothing like the original COD and united offense expansion pack for computer. If you run and gunned in the original, you would be taken out by me with a kar98 within seconds.
With that being said,.. the Nazi Zombies is rather entertaining.