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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When I use the throwing knife I get maybe an 8 out of 10 in terms of accuracy. It's actually very clever in it's construction and once you get a precision hit with it it usually is a one hit ko. I don't think it needs a buff. Every class has a weak spot and if this is ours I don't mind it is something that gets extremely strong with practice.