Maybe it's because I haven't played this game enough to get to level 20 but so far, even half way through lvl 18, I'm finding the throwing knife to be seriously underpowered. I can one shot your basic minions with it but any enemy with a yellow health bar or a shield, I can get a head shot with it and it barely makes a dent. For a weapon that's got such a long cooldown, it should be more powerful. Of course, once I get to 20 that may change. I hope so. I played a titan during the beta. I'm kinda thinking I should have stuck with that.
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The thing is when you reach a higher level you'll just fight harder enemies and throwing knife will still just be weak. It's to weak to really be used in pve. I use the other subclass which is just a much faster more melee oriented class