George Lucas is by no means a bad editor, quite the opposite.
Which is why the SE’s are such wonderful edits? (Such how Jabba the Hutt is edited in to exposit information already given by Greedo?) Or how the official PT edits cut key scenes about the birth of the Rebellion, in which Padme took part and had to hide it from her husband?
…Can’t tell if serious.
There is an argument that he got worse as he went along. The SE is baffling in many regards, and obviously that’s his worse sin.
But the problems of the PT mostly lie in the directing. Cutting out the rebellion scenes is honestly pretty smart, considering they add nothing to the story of the film itself and most of the acting in them is really bad.
And I’m not joking at all. The original Star Wars is a perfectly edited film. Mostly because of George Lucas.