In the movie Split (Blu-ray release 2017-4-18), the antagonist has multi-personality disorder, abducts three girls with unclear motivation, and spends much of the screen time being crazy, or talks to his psychiatrist.  There is little tension to be found.  All those talking scenes do not achieve much, except for providing a basis for the climax.  Since the climax is foreshadowed for a long time, seeing it happen does not bring any actual surprise.  I’m also not fond of watching movies having a little girl sexually molested by her guardian, who happens to be the only person she can depend on, since she has no friends or parents.

Unbreakable (2000) is structurally similar in that the primary objective of both movies is to establish a character with special abilities (origin stories).  The 2000 movie is much better in every way.