Not watching the OT before writing the PT.
Lol, true, but I think his worst decision with the PT was not letting someone else direct it. He’s a big picture story guy, but he’s no good with actors or dialogue.
This is absolutely spot on. To this day I will defend that the general story of the prequels is really strong but the execution was so awful. If he chose skilled directors then I think the prequel trilogy would have been loads better.