I'm breaking out the hunters for 60th to 70th.
For the tradeskill reasons, although I only really need 68th.

So far in Hellfire, they're as fun as they were 1st to 60th, with RAF.
I'm doing 2x BoA +exp items per toon.
And they all have slow flyers now, which is a huge boost.

I've spec'd them all Beast Mastery.
Just open with a shot of any sort.
And the pets destroy whatever I'm attacking.
Not sure if its the best strategy for them, but with 5x hunters it's pretty good.
Volley is quite good too.

An 80 mage, totally wrecked the team, doing the Hellfire Fortifications.
Not really sure how they compare to my other teams, in this regard.
My PvE team, didn't really do pvp quests until Grizzly Hills, at which point they were stronger then any 80 they met.
And my 5x Feral didn't take out 80's until 67th... which the Hunters aren't at yet.