I am dungeon crawling with BM 5 hunters. Just started but so far so good.
I have petattack on 3 buttons for group pulling
Button 1 = pet 1 and 2 (Mob1)
Button 2 = 3 (Mob2)
Button 3 = pet 4 and 5 (Mob3)
And this tactic works fairly well.
But then again I just started this group (Ragefire, Deadmines, W. Caverns) with no party wipe so far at par level.

With this group I have the most fun, more then with the other groups I am playing.

I also have a 1 Pally tank, 3 MM hunters and 1 Shaman healer, (level range 78 - 82) and that group goes like a tank true all normal instances. (TBC I did all heroics with level 71/73)