I have a Motorola H700 headset. I can hear other people, but they can't hear me. I know it works because I use it for regular voice commands & it's fine. I just can't figure out why others can't hear me in co-op games.
I'm using the ps3 bluetooth. Last night while playing My buddy could hear me fine but when he would talk it sounded like he was underwater or something. Then another guy in the match I could hear fine but he couldn't hear me. I'm going to try the suggestion of turning off voice commands. It can't be related to the headset since it works fine in every other game I have.