CoD4 is pants on PC because dedicated servers means "lol let's put 64 men on a 12 man map because that will go great". Even promod now is very poor because of a small community and nothing but a prefire competition.
More casual multiplayer games like CoD, Fifa etc. are pretty much all better on consoles because of the player bases. A multiplayer game is more affected by who you play with than whether your texture is 1024*1024 or 4096*4096. Particularly older games that could very quickly die on a smaller PC audience.
Yes graphics will be better on a PC almost invariably, but there's a lot more to gaming than just the graphics.
Plus you get all the exclusive that PC doesn't generally, particularly in regard to the likes of Forza and Gran Turismo.