Well even his good games can be deceptive. He pads his counting stats through sheer volume but he doesn't defend well and most infuriatingly he creates a lot of opportunities for the other team off his missed shots. If you look at his 2016 playoffs game log, you'll see that his overall +/- is negative. He really has to do a lot offensively to make up for all the opportunities he creates for the other team and when he doesn't, his overall impact is negative. As other pointed out, he's at his best when he can drive to the net and draw fouls. When he doesn't draw the foul, he ends up settling for a terrible shot like a double coverage fading jumper, a two from just inside the line or an awkward three attempt airball.