My Kennen somehow manages to land a Shuriken on a Gangplank running at 450 MS

But when I get in range to Surge, he clicks me and Parrley's for 650 damage, which is more than I did to him with my Q + W combo, and I've lost a significantly larger portion of my health pool than he did his.

Alternatively, I land one on an ADC and it autos me for a 650 crit and life steals back most of the damage I dealt.

This risk vs. reward is severely fucked up. Why do unavoidable point-and-click abilities do more damage than Kennen's skill shot + W follow up, from the same range?

Right now, I'm not being rewarded for landing skill shots. It makes no sense.