"I think the critics felt that they were going to see an extension of Star Wars. In other words, they wanted another Star Wars. I decided that the potential was much greater than a rerun of Star Wars. When I finally accepted the assignment, I knew that it was going to be a dark film, with more depth to the characters than in the first film. It took a few years for the critics to catch up with the film and to see it as a fairy tale rather than a comic book."
January 1, 1970
https://en.wikiquote.org/wiki/The_Empire_Strikes_Back