I've seen a few level 80 mutilate raiding builds proposed here, and none seem to give much love to the 51 point assassination talent "Hunger for Blood." I am assuming that is because it doesn't seem worth the energy cost?
However, I wonder how exactly does the ability work? Is it usable in stealth - for instance could one "preset" them self with a stack of three before combat begins, let their energy regen, and only worry about the 30 energy cost (15 if you happen to have a harmful effect) once every 30 seconds. That seems to be pretty efficient for a 9 percent increase in damage.
Also, could someone direct me to some discussion on "Cut to the Chase?" I have seen some discussion on rupture and eviscerate potentially being fairly close in their damage capability come WotLK, so I wonder if the talent is also another potentially powerful one (2 combo moves for the price of one)?