I'm going to have to side with Sam_Lu on this one. Obviously none of us were there on the set(s) so we'll never know the full story, but it seems pretty obvious that if you were to quantify the amount of creative/artistic input contributed to ESB and ROTJ, that the majority came from people other than Lucas (Kurtz, Kasdan, Marquand, ect). BUT, not only that, they actually made the movies EXCEPTIONAL. To disregard their contributions and instead consider them as nothing more than mere 'labor' is, well, just not my opinion.

And if you want proof, I present to you the prequels and the SE's.