I think Charles Barkley summed it up pretty well when they were talking about Game 1: "when Golden State makes them, we call them 'spurts'. When they miss, we call them quick shots."
Honestly, a step back 3 with a defender on you is generally a bad shot. A pull up from 45 feet with a defender's hand up is generally a bad shot. Curry just has an uncanny ability to make those. But yeah, I'm with KD on this one. Curry sometimes has bad shot selection. He just has extraordinarily good shot making.