Most disappointing films.

In a conversation the other day I came up with a list of these, and to my surprise they were all SF/F.
(1) The Return of the Jedi
(2) The Lord of the Rings (Bakshi version)
(3) Dune (Lynch version).
Not that I haven't seen far worse movies, but in each of these cases I was expecting something better.
Of course other people may have different lists.  And I did like Dune somewhat more the second time I saw it.
William Hyde