According to NBA.COM's PIE rating system, Dante Exum was the worst first round rookie in this year's summer league with a PIE of 4.80.
I know these kinds of stats aren't that meaningful, but, ouch, the numbers sure looked bad. I only caught one of his summer league games, the one against Portland, and I was not impressed. He didn't dribble well, he didn't shoot well, and he didn't seem to have the lift, strength or balance to finish well.
But, he sure does have a lot of potential.