My 5-man team consists of:
*Pally
*Priest
*Warlock
*2xHunters

I originally levelled 3 hunters but got sick of occasional range issues and wanted to include a warlock for utility, but so far I wouldn't even consider swapping them for anything else.

They are one of those classes that are easy to learn, hard to master, which could be seen as both a perfect candidate and a horrible candidate for a multibox team.
This is because they can do decent DPS just by spamming your basic rotation, yet to juggle their cool down’s/pets/mana(shifting from viper to hawk can be annoying) can be a bit difficult if you are concentrating on other things.

I have gotten used to it now however, and I find their CD's are similar to my warlocks (spec's being marksman and Demonology) and their utility is pretty damn good if you take the time to use some of their skills (FD,traps,MD,etc)

For the TL;DR, the only issue I have with my hunters is always forgetting to change aspects when they run out of mana!