I had my four pets and four hunters auto shooting a paladin keeping a tower in eye of the storm the other day (plus my druid hitting him a tree form, but ok, that's not much damage). I just could not kill him until he ran out of mana. Rather impressive. Five like that would really be a pain to take down. Probably hard to manage though, he seemed to have quite a hard time keeping up with my (modest) burst damage and the constant interruptions from pets.

I can confirm 4 hunters must be quite annoying, especially to cloth wearers.