Originally Posted by
Bullettime
Would also argue that design direction moving towards the end of the beta contradicts your opinion a bit. For anyone who actually tested and paid attention to official feedback forums, Fel Rush being a core offensive tool was being considered by the actual high tier mythic raiders who were playing with it "awesome, fun, but not sustainable." This is why Fel Rush was then nerfed (just not enough) and its functionality drastically changed, along with Fel Mastery being reworked in its current form to provide the old version of Fel Rush as an option.
But around this same time, Blizzard overnerfed the mega Eye Beam build because it was massively broken, especially Demonic when used in PvP, and proximity to live server launch resulted in no more classes getting any real tuning until live data could be offered. Some classes got some smaller tuning in the 7.0 launch but Demon Hunters, being that they didn't have all their talents until 110, and classes needing larger tune ups, have had to wait for the upcoming tuning pass that corresponds with raids opening.