You haven't really played CoD if you didn't play CoD2
I have played this game for probably more than 4,000 hours and, few bugs apart, it was always nice to play. Yea it could have gotten much better, but well, the zPAM mod for the multiplayed helped it a lot. Single player is very good but I have played mostly multiplayer, even on ladders like ESL and Clanbase. I could never beat my cheater friend Niko, but on the other side we build kind of a nice group at that time. You can still find some of my fragmovies on Youtube (search for "cod2 italian style fragmovie" and "cod2 biohazard fragmovie"). I hope one day this game will come back in better shape, maybe with a remake or something similar.