Call of Duty: Ghosts current-gen versions hacked before launch
This is why a host based system is pointless, its too easy for a host system to get an advantage. I wouldn't play this on PS3 or Xbox 360 now.
Also, this video emphasizes that Ghosts is not powered by a new game engine. If the hack was based off a Modern Warfare 2 hack, then parts of the game code is the same as a game from 2009. Everyone is basically buying the exact same game every year with new maps.