I think the decision to make voice chat only available in your fire team isn't the greatest idea ever. When I started one of my first missions and there was just some random guy next to me doing the same mission, I wanted to communicate with him and work together, but as I found out, the guy couldn't hear me! Why??????? If I thought the person was annoying and didn't want to hear them, a simple mute button does the job. Also, how can the so called "competitive multiplayer" be [b]competitive[/b] without [b]communication[/b]????? The whole decision of making voice chat only available in your fire team really hurts the whole experience of playing this game in my opinion. Playing games online is to have fun playing a game with other people and taking voice chat away makes the game pretty much single player.
So even in pvp you can't talk to other teammates unless they are in your fireteam?! That explains why I couldn't hear anyone and develop teamwork.