druids can never lose in pvp, if needed they escape
http://db.vanillagaming.org/?talent#0zL0hZVzxoZVtckeq0o (resto pvp spec, which is fine for mc aswell)
tranquility is a pure mana waste, the only right purpose i can think off is when u need to heal up 3 or more people in your party at the same time
as a lifesaver