I have been noticing this XBOX invisible hack used by cheaters more and more often in multiplayer games. I played with two individuals today who were using it non-stop. Their gamer tags were, Zoe 305 BDL and BLOODREAL. I went online and apparently there are YouTube videos of this hack available online. Please fix this issue before this game dies completely. I left MW2 because more and more people were starting to use the hack where they were flying all over the map and now MW3 too. WOW !!!!
I know how you feel. It is getting annoying and hope they fix it cuz it killing the game