Would anyone in their right mind vote
Sith?
Yes.
Sith's problem is that it doesn't have the creative room to do anything original because it has to reach a known endpoint -- the fall of Anakin and the battle atop the lava.
Sith is two and a half hours of waiting for something original, something
surprising to happen, and it never does.
That's the handicap that the whole PT was laboring under - being a story where "we all know what happens," yet needing to be surprising and engaging regardless.
But even so, there's no reason why the PT needed to be as horrendously bad as it was. The reasons why Anakin fell to the dark side could have been surprising and also have made sense, instead of being idiotic because the whole story hinges on the main character being a contemptable moron. (
The Clone Wars is coming up with much better ideas in this regards.)
And even for the Mustafar battle, Lucas could have played around with our expectations of what that battle was about. Other than it being Anakin vs Obi-Wan, and Anakin loses rather badly, what did we really know?
Turn the story on its head so that it's ironic and unexpected. It could have happened
before Anakin fell to the dark side. It could have been the
reason Anakin fell. There could have been some other unexpected factor that changed the meaning of the battle - Obi-Wan was fleeing with the twins when Anakin forced him down onto the planet, and to Obi-Wan, the fight was about preventing their daddy from finding them and safeguarding the future of the galaxy in a very personal way - personal for him, personal for the audience.
Those are just some random ideas to illustrate the point that for an ambitious, creative mind, the basic story of the PT was an opportunity, not a burden. The possibilities were endless. After all, it has a big advantage over most stories: an audience that is already interested in it. You don't have to convince people to care enough about the characters to go to the theater. What a massive wasted opportunity.
The only thing I can think of is that Obi-Wan, not Anakin, might be the actual father of Luke and Leia.
Okay, one thing I can say for Lucas is that he had the good sense not to go
there!

(Even the scene where Anakin flips out and accuses Padme of having an affair with Obi-Wan made me cringe.)