Absolutely loved the first Call of Duty and I think this one is even better - The graphics and realism have been improved and the first one was good enough. It's actually a game where you need skill and that can come with playing which I think many games lack these days, for example there is that great feeling when you get a shot that you couldn't get when you first started playing. It never gets boring and your always dieing to see if the next level is even more entertaining.
It's quite expensive but not too bad especially for the fun you get from it. So go get it now!