Nah. ROTJ suffered because after Gary Kurtz left (was fired?) Lucas arbitrarily decided to throw out the outline that had been written for ROTJ when they wrote the outline for ESB (I *think* the original ESB/ROTJ outline was written as one long outline, and split in two at the best "cliffhanger moment," - then "part 1," or ESB, was written, with the second half to be written later). I think he did this because he hated ESB (he's gone on record as saying that ESB is his least favorite Star Wars film).

Then Lucas made up an entirely new outline, which would tie up all the loose ends that were originally meant to be left hanging for the "sequel trilogy." Problem was, he had too many loose ends to tie up satisfactorily in a 2-hour film, so he forced several contrivances (*cough*Leia as Luke's sister*cough*) in order to make it work.

So if the original outline had been written as a script, Leia would not have been Luke's sister, and ROTJ would have ended in such a way that it was a satisfying ending to the Luke-vs-Vader saga. The sequel trilogy would have seen Luke becoming a full-fledged Jedi (possibly training other Jedi) and searching for his sister, set against the backdrop of Luke vs the Emperor. while the Rebel Alliance tries to end the Empire once and for all while establishing its new Republic.

Of course, since the original outline has never been released (to my knowledge), that's all just conjecture on my part, based in part on facts.