Random Arenas is a battle ground were: a) team builds b) Team Speak c) Guilds teams are irrelevant.
So, in Random Arenas team work may be more important than in all the other grounds, because, in Random Arenas, team work is the only remaining thing after you take out a) team builds, and c) Guilds teams. I think, that lacking of b) Team Speak or Vent or Skype may be one more reason to think that team work based in players actions, what you can see and heard ingame, and simple calls. Anycase, Team Speak or Vent, Skype are not needed when there are languages barriers, and I think that many RA players do not miss this means of communication.
So, I suggest, to add Team Arenas in Ascalon, and the Siverpeak, as well as allowing to PvP starters to go into Team Arenas directly. So that Random Arenas is a more serious battle ground.
If not, I suggest to make some high level Random Arenas.
I believe Toluus when sais:"Here people from all over the world participate in the purest form of combat. Unpredictable territory, unfamiliar allies..." but, think my skill and my will to survive will help me, ... cooperation with 3 more players is as well quite relevant to be said... to be a help

Well, this message may be laughed by some or may be though to be controverted by other, but, I think, that to play in random teams is a game style in its own, and I hope that some more may understand this as well.
What do you think?