Better editing, a better cinematographer.
Different directors for each movie.
If Lucas had to write and direct the first prequel he should have collaborated like he did on Star Wars '77 with other writers.
He needed someone to argue over the scripts and the plot and general direction.
Should not have set up the crew like he was making a video game for lucasarts, i swear the making of looks like a computer game production not a film production because of how much is put into the cgi component.