I always viewed ESB as the film that opens doors. Not really answering secrets, but uncovering them. In a way. - Luke opens the past by hooking up with a long-forgotten reclusive Jedi Master. It opens up that world we didn't have in ANH. "This is how Jedi were." - Vader is Luke's father. At the time, it was speculated he wasn't. Either way, there's something Vader knows about Luke's father besides he's dead. Another door opens. - Ben may have lied to Luke. Ben's motives are now called into question. - Han and Leia take the whole film, but they reveal their feelings to each other. To me, *these* are the things that make it a great SW film. We get new characters (Boba, Yoda, Lando) and learn the story is deeper than we once thought. This is the reason I liked the PT so much, too.