Well, some movies help explain things, Godfather II's flashbacks, and then the continuation of the main story. (Let's not mention III, though it's getting a re-do, apparently.)
Yup, SW is a nearly perfect movie. Mythic, heroic, joyful. I'm ok with the PT, due to fleshing out Anakin, since Darth and his redemption became the crux of the OT. Not necessary (PT), but still tied-into and set-up to the OT.
As movies, I won't rewatch them, though. The main characters (PT) are so devoid of verve cf. to the originals. I've heard the OT actors joke, Lucas would do another take and tell them to speak faster. With the PT, it's like he told them to go slower.
As movies I did enjoy 7 and esp. 8 due to all the things others hated. So it goes.