Well in general hunters are super bad at RBG
They cant def, or carry flags
The only think they can do is tons of damage (The problem well patch 5.1 nerf BM and Surv and MM still sucking balls) so we are like our 3 specs are nerfed as hell
i dont recommend to carry more than 2 hunters in your group
they can be helpful with flare traps and health debuffs
If any hunter in you group its a BM, they should use devilsaur pet (he has health debuff plus 5% crit buff for party)