Out of the three films, I would say ROTJ has the shoddiest looking production value. While the space battle is great, a lot of the areas lack a fine polished feeling that ANH and ESB had. The movie doesn't have that feel that you are watching a galaxy far far away. It feels like you're watching a movie filmed in studios of California and London and in the forests of California. Oddly, ROTJ had the largest budget: $32 million I beleive, which I beleive was a lot at the time. ESB's budget was a little over $20 million and ANH was $10 mil.