ROTS is my favorite of the six movies (I have not yet seen TFA, I am waiting for the Blu-ray).
Why?
And IMO EpIII more or less did an excellent job of filling in that backstory.
I think the fact that Anakin was tricked (instead of seduced) into becoming a Sith Lord invalidates the entire film. That’s just me though.
“Tricked” is a synonym for seduced.