What impresses me most about Shaw is the way he effortlessly glides with the ball at his feet. He is a deceptively quick dribbler because he doesn't rely solely on pace: instead he makes use of his exceptional close control. When he's progressing the ball forward, it always feels like he's in control of the situation.
Also, he's rarely wasteful with his passing. When United have the ball in a dangerous position on the wing, I am more confident in Shaw delivering a perfect cross than any other player. So many Premier League full backs regularly overhit or underhit their crosses, whereas Shaw's crosses are often perfectly weighted.