The game it self is becoming more unstable every day as more people start "UFO"ing and Invincibly Hacking. How is this done? A USB drive and a few Tweaks with COD4 save data files can result in people flying around the map hiding in walls and other solid objects in the game. Although IW are "on the job", carnage is still rampant as almost every game comes with at least one person acting like Keanu Reeves in the Matrix. Hopefully IW won't make the games online .ini so easily editable in there next game coming in 10th November...
This is what it is like right now: http://www.youtube.com/watch?v=Yc2KM1gS9tI&feature=related