It's a bit ironic that the Jazz started playing better once Exum entered the starting lineup, because in some ways they're playing 4-on-5 when he's on the court. Exum really has little idea how to play on offense right now.
The good news is he appears eager to learn how to be a point guard. He is doing well as a ball-mover, and he doesn't force the issue on offense. The fact that he's rarely in a rush is a sign that he's trying to figure out this complex game. And there is value in having a point guard run the team's offense, especially when he can't score efficiently on his own.
Exum is showing incredible potential on D, too, with his length and eagerness to defend. So, putting it all together, it's easy to see why the Jazz drafted him and then inserted him into the starting unit.
Next season, he should be a vastly improved player because the shots he's creating and missing now will be ones he makes far more often. His length and size will be of great help to him, and the game will continue to slow down for him. If you look past the missed shots and confusing decisions at times, you'll see his star potential.
Best bet: All-Star