I agree, it is very helpful when people work togather as a team and communicate as much as possible. I certainly try to do this myself, although it has gotten me some sarcastic comments

but I personally find that the only way to beat an organized team is to be organized yourself.
I played a random map and the spawns put one guy from the other team into pretty much the middle of our team (two of us on one side, two on the other). And although we killed him, he lasted long enough and kept us from taking full control of our back area long enough to cost us the game, and why did he manage to pull it off? Because his team mates helped him, not only by timing their attacks, but also by giving resources to him (which is stupidly rare in MP I've found, and often when it is brought up, your team mates will expect you to give them whatever they need and then they don't return the favor, at all). Not of course that this really differs from any other game (aside from the overall good AI control).
Anyway, I'd be quite interested in putting togather a group of regulars if others are, I did that in my last game (Supcom) and it made it not only fun, but also added more depth to the gameplay imo.