Communication is the key to a team
I have just started to hook with other players and I wear headphones and a mic, I seem to be the only one, not being able to communicate with the team is a downfall I'm finding, not knowing whos doing what, it's like where a team but not a team if you get my drift, it's like a organised chaos, and putting in the time, after time not knowing what the other members of the teams objective is, shooting the hell out of wave after wave, "for what". Killing just for the sake of killing, in any battle there is a objective.
Is not speaking to others in your team the norm.