(Last note) I think Lucas is an inventive writer. After working in the film industry for 5 years, I have come to the conclusion that no writer should have free reign over a script. Because any writers, especially inventive ones, have just as many bad ideas as good. However, writers love their ideas like babies and have trouble hating the bad and loving the good, they just love them all equally. So, that's were you get great pieces like Qui-gon next to a bin piece like Jar Jar.
Behind every good writer sits a good editor. With a good editor JK Rowling would've cut a good bit out of the Deathly Hallows, or at least spiced up the time Potter spend in hiding, those months took way too much time in the book with nothing much happening to show some urgency.
With a good editor and publisher Robert Jordan wouldn't've released a complete WoT book that spanned 24 hours of nothing happening at all.