Great to hear that people actually still play this. CoD4 kind of f**ked up the whole series, what I like about the classic CoD games is that there are no options available to upgrade. No perks. No addons. That's why I enjoy playing Red Orchestra 2 so much, reminds me of CoD2.
I don't have CoD2 installed right now, only CoD1 and UO. Great games, still play them alot. Might be worth installing it again to check the multiplayer out.