Return of the Jedi has too much expository dialogue. There's that whole section where there's a talkie scene between Luke and Vader, then another one between Leia and Han. It was captivating on opening night because unknown information was being conveyed, but the scenes are ever-after unbearable ... precisely because all they are is exposition explained in a dull manner.

I'm not saying the ratio of poorly-executed exposition is equal between the O.T. and P.T., but I think Jedi is the worst offender of all six movies. *

* admitting that maybe I need to watch Episode One again to make sure, but ... ugh, I don't want to. What an awful film!