In fairness to Lucas, sequels are always inferior, so in that respect, we should all be grateful to the quality of ESB. Think about almost EVERY movie series, the movies usually get worse and worse, and I think in that context that is what seperates the OT from everything else. ROTJ is not great compared to SW & ESB, but compared to Superman III, Jurassic Park III, Matrix Revolutions, Back to the Future III, Terminator 3, Godfather III, Alien 3, it is a damn good movie.