Come on man. Lucas wasn't even fully responsible for the best Star Wars movies, or many of the best things about the good Star Wars movie he directed!* The script of Empire Strikes Back, probably the best Star Wars film, is only 'based on a story' by George Lucas. THX-1138 is pretty good, and American Graffiti is ok, and I like some of the ideas behind Star Wars, but it's hard to argue that (at the very least following the success of Star Wars) George Lucas is not a raging, smug egocentric who works best when his ideas are strongly reined in and polished by other people. Literally every decision he has made since he wrapped post-production on the original Return of the Jedi has been on some level dreadful. Also, pursuant to indirect evidence from the Star Wars prequels, there are those Indiana Jones brainstorming transcripts that confirm that Lucas is almost comically racist in a very sad and ignorant way.
* Great things about the original Star Wars: special effects, sound design, music, production design, some cinematography, some performances.