I have been having the same issue where whoever is not the host has a controller delay of about maybe half a second to 1 second such as moving, looking or even shooting, anything to do with the controller. But whoever is the host has no problems. And I know it is not my connection or any of my friends. We know how to work our **** we don't just play, we game. This makes it close to impossible to play the game on live co-op which is one of the main reasons I even bought it. 343i please fix this. Twinreaper if it's not too much to ask can you please try live co-op as the 2nd player and give some advice. I don't understand how this game was even released with this issue. They obviously did not even test the live co-op. It's impossible to miss, especially if you know how it is supposed to play.