At the second time I saw the film with my mother and it wasn't that good experience. She haven't read any of Tolkien's books but has seen FotR and TTT (original versions).
Well, she didn't say anything during the film but kept glancing her wrist watch. Afterwards she stated that the film was confusing and incoherent
That's what you get if you don't read the books...
Anyway, I'm glad that she liked the previous films and she said that she could watch RotK again (...if it would make more sence then).