Huh.... I thought youre talking only about multiplayer... =|
COD did have some great moments, like the sniper mission and i played the first cod like crazy.
But i never got the feeling of a "reality" out of cod, on the other hand there was this mission in BF when you and your pals need to storm a house... And the way you had to cover your friends and overwhelm the AI with fire power before you leap to the next cover... It was great =D