To put it in perspective,
Bradley Beal shot .445 overall and .339 from the 2. His ft percentage was .769.
Deon Waiters shot .476 overall and .363 from 3. Ft .729
Now I am not saying that Marshall is as good a shooter as these guys. He did not shoot nearly as much and had much more open looks when he did shoot. BUT THAT IS WHAT A GOOD PG IS SUPPOSED TO DO, GET HIGH PERCENTAGE SHOTS FOR EVERYONE AROUND HIM.
Getting high percentage shots for guys around him is his strength. I think we all agree with you there but that is not all he is suppose to do. A PG is expected to score as well and we have seen what happens when Nash isn't scoring but still dishing out 10 assists.
Shooting 34% in jump shots and the rest of his shots in the lane I think is the big question. IMO he will have trouble getting into the lane with his limited speed at the next level. Which means the Suns are going to have to fix his jump shot.