It's OK.

Rating: Null/10 (14 October 2017)

I am rooting for M. Night. Really. Unfortunately, his films of late were a let down. Hence, I am keeping an open mind on Split. The first sign of a series of disappointments were on the first 10 minutes of the film. The Marcia character could not act. I just want to slap her or wished she is the first victim so I can enjoy the rest of the film.
John McAvoy to the rescue. This may not his finest but he can make an average script work. The story trudges along slowly. In the meantime we learn that Casey was abused. The flashback scenes were predictable, - camping trip. This could have been shorter. We get it why Casey is an outsider. Five minutes will suffice.
The motivation of the psychiatrist who protects her patients needs more clarity. Does she want a Noble prize for her discovery? Seriously? The case of the blind patient regaining sight and the mention of McAvoy's split personality dilemma (spoiler) are clues served on silver platter. She seemed hopeful this will have a rosy ending.
The third act is already revealed. There are some scary moments but that's about it. I was hoping this new M. Night is a better outing but it's just OK.