I like playing BM hunter but seems every other hunter I talk to says MM hunter is the best spec at the moment. BM burst is pretty straight forward you got abilities that deal increased damage with Bestial Wrath.
However MM doesn't seem to have anything in terms of damage. Rapid Fire is haste and focus regen. Stampede's damage is pretty low without BMs mastery.
So yeah like for instance you doing some arena or rbgs you CC a healer or whatever and a burst target is called out.
What MM do? Arcane shot crits for only half compared to BMs Arcane shot under Bestial Wrath. Chimera, well, is on a hefty cool down and if it don't crit that's gonna suck.