It's the worst one, but I still like it. Cuz, the worst SW film is still a million times superior to most of the other visually uninteresting drivel some people call movies.
It's the worst because the entire Jabba's Palace sequence is nigh-unwatchable and irrelevant. These days I skip it as soon as 3PO is dragged away, as he's the only one saving the Tatooine-parts.
It's also the worst because the director was partly overwhelmed, partly too much under Lucas' influence. The characters aren't nearly as good as they were in TESB, most shots look dull and standard and the pacing has more problems than just Jabba's Palace.
If it wasn't for the Battle of Endor, especially the awesome saga-worthy Luke-Vader-Emperor-threeway, I would never watch it anymore. But Vader's (not Anakin's) last words are just orgasmically awesome: "...THEN PERHAPS SHEEEEE WILL!" *cue Dark Side Beckons*
oh yeah, John Williams does an amazing job too (minus Den of the Rancor...). The Imperial March has more interesting variations in this one than in TESB, the film that introduced it - there it was always militaristic; here... it's played on sad violins! Awesome.
Also, I don't mind the Ewoks. They don't beat the Empire, they provide a distraction until Chewie gets his paws on an AT-ST. HE beats the Empire.