Deuce is a work in progress at PG, but it takes time and he hasn't had a lot of game reps. Teams will trap him and he picks up his dribble too quickly. He also seems to have issues with shot clock awareness as the clock will be winding down and he'll feed someone too late or not start looking for a shot himself. Over time he will get better at these two pieces and that will help him run a passable back up point. 2nd level is how much better he gets at creating for others, but there's some game management issues that he needs to clean up first.
That said his value as a 3 and D player is rising. Clearly he's not a wing, but given the proliferation of really strong lead guards in the NBA, his value as a matchup player is rising. The fact that he has been totally money on catch and shoot and corner 3's gives him the ability to play off the ball next to Brunson and take pressure off him on the other end of the floor. That will be valuable in the right playoff matchups. He may not have as much value in helping us beat Boston, but I think he helps vs. Cle, Indy, Philly, Milwaukee that have quick, scoring PGs.