When I played MOH a lot when it came out I could probably guarantee that if I played any of you, I'd have wiped the floor with you and you'd have called me a cheat / using hacks - I think anyone from TFU would probably back that statement up. Reality is I was sat in the top 15 in EU rankings for about 5 weeks straight, there's so much more depth to games than people realise which is what gives others advantages over some people. I don't mean things like surround sound etc, because I don't have any of that, but learning how to read a game and paying attention to minute details, learning how to anticipate the game is what makes a decent FPS gamer - hence why I stopped playing competitive CS (long story, but a few people in our 'clan' was adamant that I hacked, to the point that he's actually packed up PC gaming completely).
As above, I'm not saying that there aren't hackers, in any game, but the reality is 90% of the time, if not more, it's simply someone better than you and you're neglecting certain details of the game (biggest one in most FPS games now is the UAV).
Get over it.
If you're that concerned, play at LAN and nowhere else, but then again there are quite a few LAN hacks floating around as well now...