I think the first 3 quarters of ESB is pretty good but the last quarter or so is cheap. The sets start to look cheap and frankly look like sets. When the movie takes place at Hoth or in space or whatever even the the special effects and sets arne't 100% convincing enough they're good wenough to the point where you can suspend your disbeleif and really feel like the movie is real and is really taking place in a galaxy far far away. But once they get to Bespin all the atmosphere gets thrown out the window. All the sets look plain, cheap and white. It totally makes you think the characters are in a set. The point where luke fights vader in that big retarded shaft facility, what the hell was that? It was just a cheap excuse of a place to have it decorated like the way george wanted it with no attention to continuity in the story. The area looks like something the empire would have but it's taking place where the empire has nothing to do with the place.

The sets in ROTJ got even worse. WTF were they thinking?

The original Star Wars is the only one of the series where the whole time I feel all the sets are good enough to make you feel like you're totally immersed in a real story.