More so than you can tell in one game. For example if the only game you ever saw Jones play was 02-08-2014 where he scored 2 points in 23 minutes and was completely schooled by the Bucks, you'd think he was awful.
He was "good" when he had 2-3 playmakers (Parsons, Harden, Lin) to help him out. He's a garbage man that can't clean up the boards, a stretch 4 that can't consistently hit 3s, a low post scorer that probably has more TOs in the post than baskets.
Exactly this. When he had guys setting him up for open dunks all the time, people saw his points total and thought "this is a good player" despite the fact that he couldn't do any of it on his own.