Bingowings said:
Most importantly Lucas should not have written it all and only directed maybe the first one if that.
ANH and ESB worked because they were team efforts pushed by his energy the rot set in with ROTJ and Lucas should have realised this and played to the strengths of what worked before.
This is the only "what might have been" aspect of the prequels that interests me. Frank Darabont should've been the PT's Lawrence Kasdan. Joe Johnston would've been perfect to direct one of the movies. Lucas writing and directing the whole thing himself was what prevented the PT from rivaling the OT and made it "just some prequels." Considering Lucas admitted he only had one movie's worth of material, yeah, he really should have known better than to do the whole thing on his own.
This is sorta stream-of-consciousness, but here's an idea that just came to me in terms of "what might have been" behind the scenes:
Episode I, directed by Steven Spielberg. He's known for working really well with child actors, so he'd be perfect for this (assuming Anakin would still be a kid in the script).
Episode II, directed by Joe Johnston. It's "the one with Boba Fett," the character Johnston himself designed back in '78. Also, there's the Anakin/Padme romance and I can't help but think of Johnston's Rocketeer.
Episode III, directed by Dave Fincher. There's probably a better-fitting director I could think of, but this is what's coming to my mind right now. He's an ILM and/or Lucas alum just like the other two directors and he's known for dark movies, making him a good choice for Anakin's turn to the dark side.
In any event, the original 1977 Star Wars should've remained the last George Lucas directed film.