You're right with all of these, but one fact remains: without using headsets (and therefore being able to talk to one another) you will never be able to properly play these games. You just don't have the time to chat while firing at the enemy and you also know that no plan survives first contact, so you need to adapt to the situation in the game - and tell that to others.
Were we to try it again, I'm 100% sure it would work differently this time since we have some experience now and know what does work and what doesn't. I just posted this here because 1) I'm a tank nut, 2) it's completely free and 3) because of 1 and 2, I'm gonna give it a try and thought that someone might be interested as well with whim I could maybe coordinate team play.