Fairly new to the Hunter class(in a raid setting), I love the new Focus aspect. Resource managment is a good thing. I see some possible issues in PvP but have the confidence that Blizzard will get(have gotten) the balancing at 85 good enough to enjoy.
oh yeah, that was annoying...Focus is so much better than the incredibly gimmicky Aspect-swapping, Damage-reducing Mana.
focus > mana