I've leveled up hunters in the past to 65 in Burning Crusade and they didn't feel right. I just leveled up some more to .. 14. (Ya I know) and there was still that feeling of.. hmm something isn't right. It's important to try out the class and see if it feels right to you. The best reasoning I think is hunters are what Dorutea said, kiting kings. As a multiboxing team that is extremely hard to pull off. When you can face smash with so many other classes.

I imagine in a 5v5 multiboxer vs multiboxer, the one with the hunters has the potential to completely destroy the other player due to the fact all abilities are instant and at 40 yard range with an additional 15-20 yard jump back. Under normal circumstances though they will be at a disadvantage for multiple single players.