When i'm on my priest alt i usually get rolled by a group of 2-5 while i'm out questing in the world and at a WQ hub a group of 10 or so if i happen to have to go there for my leveling.
On this toon i usually just blind whatever DH is there and vanish/sprint away and move on and observe until they get bored or allies rally and set up a group to boot them out.
Both sides will experience getting rolled it just so happens in my experience having to collect larger amounts of alliance to kick the horde groups out is more of a revenge factor since so many have been inconvenienced by the Horde gank squads.