I read some reviews and gave this movie a shot. I was very disappointed.
M. Night Shyamalan's last good movie, in my opinion of course, was The Village, where he had control over his style.
In Split he tries to use the same formula, but it doesn't work. There was no build up in reveling the plot, and then when we get to the end the feeling I got was : "Is that it ?".
Sure all the actors were good, but that didn't make the experience for me any better.