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Rating: 9/10 (29 January 2017)

Spoilers Ahead
Split is in my humble opinion, his best work since Signs. To start off with, the performances by the leads were excellent. James McAvoy blew it out of the park with probably one of the best performances of his career. The way he was able to get into every one of his 24 personalities was mind blowing. How he is Hedwig at one moment then Dennis another created some really tense moments. Anya Taylor-Joy was also brilliant, giving a really emotional performance. She sold the fact that she was afraid but yet knowledgeable on how to handle such instances. (Her messed up uncle made that so). The other two actresses were all right but had their moments of over-acting but that didn't get in the way of enjoying this movie. Shyamalan is back as a director creating some scenes with genuine terror and suspense. My personal favourite was missed by many. In his meetings with his Dr. Karen Fletcher, I was on the edge of my seat, as I was waiting for Dennis to snap when she pressed. The music, while not James Newton-Howard level, was still very good.
Now, as I have gone through some of the reviews for this film, I got disheartened by some of the reviewers. So, while I don't believe my arguments will change anyone's mind, I'll write them so you may understand my side better. The most frequented complaint I hear is that it did not represent DID well, and I'd agree, but I'll ask why did you go into this movie expecting credible science? There are half men/half beasts in this movie, true science isn't the goal. Instead, Shyamalan uses it as a starting point so that the audience isn't completely in the dark of Kevin's condition. This is done all the time in movies from Rain Man to Silver Linings Playbook, all done with varying degrees of authenticity. That's just how Hollywood works.
The next most popular critique is the ending. I reiterate, this is a spoiler filled review. So, according to the last scenes in the movie, this universe takes place in the same universe as Unbreakable. I've heard people describe it as a stupid gimmick and terrible twist, but I don't think it's that at all. Sure, if you've never seen the movie Unbreakable before, you'll be perplexed at the endings significance, and that is my biggest problem with the film. A stand alone film should not rely on another film in order to get it's full significance, but my next point somewhat excuses this, and that's why I still love this film. According to Shyamalan, he had plans to to do a trilogy with Unbreakable, and we see this in Unbreakable. When Mr. Glass speaks to David Dunn near the end of the film, he tells him there are two types of villains. The soldier villain and the brain. Mr. Glass was obviously the brain part, but we never got to see the soldier villain. I'm not mad at the ending because it was apart of Shymalan's plan all along. So this is in a way, a sequel.
There are more complaints that could be addressed, but I tried to keep this to the point. As I said before, I know I probably won't change anyone's mind, but I wanted you to see,and understand, why one fan loved the movie.