I liked it. Joined the dots well from "Unbreakable" and "Split" while staying very true to comic books and the basic philosophy of them.
Would never work as a stand alone film but it was never made to do that.
Granted it is not non stop action. Again that wouldn't work.
It builds the story and connection of all the characters until what I think is a very good conclusion, or possibly set up for a new spin off...
Very glad I have seen it.