I used the voice chat in a raid once a few hours ago. I teamed with some friends in my guild and i turned the music down so i could hear them. At first everyone was all quiet, then while on our way to raiding Stormwind, someone bursted out: "Lets stick it to those ally *****es!" It took me a while to set up my keys to reply back, then i got used to it. Taking down stormwind was no problem.