I think they are due for a buff and a big one. One hit kill type of buff (in the head). I mean c'mon, if your a hunter you know out of 10 throws, probably 2 or 3 depending on your skill will hit the target. And when it does, you excpect a kill, not almost dead but not. Just saying, if it takes skill, it should get the kill.
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Melee attacks aren't meant to be your main weapon. I myself rarely miss with my throwing knife, and do you know what havoc I would wreak? One of the abilities gives two knives, and another resets the cooldown when you kill any enemy via precision damage. I would just walk around throwing my knife everywhere, non stop. The reason they don't do 1-shot kills is because they can be used from a distance.