I think TESB’s success due to a combination of Kershner’s effort and his collaboration with Lucas. In regard to his other films, I doubt he worked as a hard as he did on Empire and, obviously, Lucas wasn’t around.
Per the
Guardian:[hr]
”Kershner's contribution to The Empire Strikes Back was considerable. He spent several hours a day for a year storyboarding the action himself, getting his perspective on each scene. "According to the books, I didn't even exist," Kershner said. "Of course, I couldn't have made the movie without George; on the other hand, they couldn't have made that movie without me."[hr]
Arkamazza wrote:
Like I said, Lucas should have gotten him to work on the PT's in at least some capacity, as AotC and RoTS felt exactly like just another couple episodes in a series of space adventures.
Kershner didn’t work with Lucas after Empire because the films were labor intensive and because he didn’t have final say in the creative process. These circumstances wouldn’t have changed with the prequels. So, it was unrealistic to think that he would help out with the PT films.
I agree that Empire is the overall most well-made of the 6 films. ANH did a good job of balancing audience identification with story and themes. ESB took this approach even further.
However, that being said, it’s a huge mistake to think that the PT films don’t have as much to offer as the OT. Yes, on the surface, the approach is “just another couple episodes in a series of space adventures.” However, if you watch an old Republic serial, you won’t find the PT’s level of depth with its main characters, a synthesized exploration of human history and mythology, and a pervasive juxtaposition motif.
As I stated over in the
ROTS forum, while the OT films are more streamlined in their craftsmanship than the PT, the PT films have much more going on below the surface than the original three.