As someone who mainly plays 4v4 with strangers, I think it would be a great feature to implement. In team based games communication is essential, however, communication is often frustrated and breaks down into toxic behaviour. In game voice chat would allow for more detailed plans to be quickly implemented and adapted, in comparison to vague pings.
P.S - And of course a mute button.
Any suggestions boss?
sounds good but will never happen in coh2. The game and the code is too old.