Playing on Dominating on my current knife thrower; I get to use the Shock Shurikens against robots, while at first they were kind of okay, as the game continues, they start to fall off in damage and overall performance, since they do not scale with Throwing at later stages of the game they are rendered almost useless, and the stun feature is unreliable.
I'd say make Shurikens scale off throwing, but maybe reduce the amount of Shurikes you craft from 10 to 5. Otherwise people will just completely ignore it past the mid game, in which at that point grenade spam, acid vials and, hell, even Expose Weakness will do a better job at taking out robots.