I've yet to personally play Call of Duty or Call of Duty 2. Me, I'm waiting to get CoD2 for XBOX360. So I'm as much in the dark as you.
However, I highly recommend you try Return to Castle Wolfenstein for Xbox. Very well done game. Supernatural spin on WWII. You play lonewolf style, too, and that's a plus for me. No squad to worry about.
I used to have Brothers in Arms, as well; pretty good game. Well-worth $20. I've yet to play the sequel, though.