I must admit I've always liked Return of the Jedi. Vader became much more developed, the Emperor provided a nice new villain to replace him as he became a more tragic figure, and I thought the Jabba scenes were pretty cool too - sort of like a longer version of the cantina sequence from Star Wars.
However, people always say that Return is their least favourite film in the series, with the ewoks being the main reason given. Though I understand that they were almost like a precursor to the childish nature of the prequels, surely it's a little irrational to harbour such a strong dislike for a film based on one aspect? I'd be interested to know what you guys think of this.