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For the 19/42/0 build is murder realy good to have because the build is good but these two points are they that good to have
Murder is not so great by itself, it's more of a synergy talent imo, where if combined with other talents, it shines a lot more. For example, with Improved Kidney Shot & Find Weakness your damage is increased by 19%, tack another 2 on there for a 21% increase in your dps.
Also think of it as an extra 2% on your Surprise Attacks/Shadowstep talents. When critting, of course the 2% doubles again, amirite?
Crazeecracker's build is pretty solid. Consider taking points out of Vitality and throwing somewhere else. (I personally grab imp kick & sprint instead)
Also in the *** tree, you could check out Remorseless attacks, when working on groups of mobs, pretty much makes' your first strike a guaranteed crit. You could swap it with murder if you don't like it.