Cinematic Universal Roleplaying System
From the introduction:
On a scale of 1 to 10, how well can your character do what they're trying to do?
That's the entire basis of the Imagination's Toybox system. It really doesn't get any simpler than that.
Imagination's Toybox originally was developed as the support engine for Knights of Torque & Recoil - it later was adapted into a genre-agnostic, general gaming system.