I disagree because he missed so many wide open shots. He didn't play bad, just missed good shots.
There were some dribble drives that were a bit ill-advised, but he didn't take advantage of Oladipo's aggression. Oladipo gambles and relies on his athleticism to make up for it, Marble didn't take advantage of that.
The other thing is, IU made it a point to throw everything at Marble, including having a bigger Watford guard him at times.
Iowa has to learn how to win without Marble hitting, they almost did today, but good learning experience.