He handicaps the entire team. When we go into an offensive drought, one of the reasons is often because MS dribbles the shot clock down and has to force a bad shot. Yes, one of the reasons his shooting % is so unbelievably poor is because he often has to take shots as the clock expires, but frequently, that's through no one's fault but his own because he tried to penetrate for the entire possession when nothing was there.
He's poison to us offensively, he's unquestionably the worst shooter I've ever seen. The only thing I hate about this team is Marcus with the ball in his hands. He has a little hot streak every few games that lasts about 5 minutes, then he goes back to being unable to throw it in the ocean. He needs to have more of a 2 role, let Rozier have the ball, and stop shooting 3s, Marcus, you're all time bad at doing it.
And yes, Rozier is far from a great shooter, but 38% is champion compared to Marcus.