I watched the trilogy in order when the movies were released originally at the time not really being aware it was a trilogy which really made them work for me. At the same time, I only really remember the main concept of the movies but have forgotten all the details. Not sure if I will ever rewatch it as it kind of lives in my mind as a good memory while a 2nd watching won't have any of the major surprises.
RE: Glass (film): Decent film but a terrible "twist wrap-up"