Not wanting to get into a pissing match, but I find more educational value in strategy games than FPS stuff.
The biggest FPS game that really stood out to me, in the realism department was the Brothers in Arms games, as they actually had suppression fire, squad interactions and so on.
That's okay. I like the fast paced twitch shooters since it gets your adrenaline going and heart beating

In the end though, its all about what you enjoy. If you got something out of it, then its all good. If playing Call of Duty got you to go read about Stalingrad or Arras, then that's a win for everybody.
I own almost all the WW2 fps titles that came out for the PS2, and enjoyed all of them, mind you. Just different expectations I think, since I do a lot of wargames (computer and miniatures)
None of us have to justify our entertainment to anyone else
