Lucas also liked the Famous Funnies covers done by Frazetta, the Buck Rogers covers. He wanted to use some of his favorite fantasies of his youth in a way that was not silly.
Make a B movie in an with an A movie budget and create a believable secondary world or universe.
Yeah he liked larry buster crabbes Flash Gordon serials, but if he really wanted to recreate that sillyness star wars would have not even broke even.
He expected it to do no better or worse than planet of the apes, but hoped it would not bomb like 2001 and take a long time to recoup costs and investment.
He used the trappings of fairy tale and space fantasy synthesized with a mythic/heroic structure.
The prequels have a harder time i think because you don't have the typical heroes journey or likeable everyman character. He was telling an antihero story, the story of the tragic hero is bitter and dark, but he through in childess nonsense and the turn to the darkside made no logical sense.
I think Peter Jackson was right when he said the audience identifies with Luke because they are Luke, the main hero is the alter ego of the viewer much like frodo or samwise is in the lord of the rings films.
I certainly did not identify or like Hayden version of Anakin Skywalker, though i found Jake LLoyds anakin to be annoying at least his childlike character was identifiable and realistic. The brooding whiny emo teen i never was so i don't get that character at all.