Just wanted to put this in about parties using voice chat...
I was recently in a ram ex PF that when we enterted the instance the leader poped a TS link and pass(I responded that I don't have TS) and that was that... the level of coordination between these people was horrible. I had seen better coordination from a DF than from them. I had people running after me with thunderstorm(and I was closest to the tank so nowhere much to run anymore) instead of going to a less crowded place. I died multiple times because of overlap either normaly or when charmed.
So yeah... voice chat won't help bad players be decent.