I've been doing some experimenting over the weekend with a Horde Hunter. I want to give the Beast Master tree a try while levelling. When I originally levelled Bzak I did it all as Marksman through level 70. Some quests were a pain in the butt, others were fine.
So far, my pets seem to be able to hold aggro constantly without any issues. Rarely do I pull aggro off and I can even get them to hold onto 2 mobs easily.
It's fun and I'll keep posting about Bzak's alter ego, Jysxyra.