As much as I hate the shit after 1983 in the SW-ville, you guys have to understand that is nearly impossible to keep churning out great movies from a movie series.
In many ways after seeing the PT, the SE, and The TV series, I am thankful we got 2 classics (SW & ESB) and a pretty good final movie (ROTJ).
Look at most movie series & TV series, the quality usually goes to shit, simply because it loses that magic after time, and it just gets stale. Just think of most TV shows near the end of their run, they are a shell of what the show was in its prime. Just think of Superman III & IV, Jurassic Park II & III, Jaws III & Revenge, Batman & Robin, etc. I could go on and on of movie series that just went bad.
The OOT will stand as one of the greatest trilogies of alltime when it comes to movies, it was groundbreaking, it created the blockbuster, it gave us characters like Luke, Leia, Han Solo, Darth Vader, and it touched a generation that is loyal even today, and will as the movies are introduced to future generations. To ask Lucas to keep up that quality is crazy cause it is damn near impossible. So forget post 1983 SW-stuff, but just remember from 77-83, SW was the best.