As a starter, Rozier is a middle of the pack type good point guard. He plays within the system, takes better shots and plays good defense. For his career he is like 15-16 points, 5-6 assists and 5-6 rebounds a game as a starter and that includes 19 playoff games where the competition was at its best.
He is God awful coming off the bench. He forces shots, the ball sticks to him a lot more with more dribbling, and his defense noticibly drops off. It has to be a mental/confidence thing because he is very Jeckyl/Hyde-like as a starter and bench player.