RT has a good news story, According to it the adveare tomato score of the original trilliogy is 54%, the prequils is 70%. Â To get the original score they went back to newpapers during the 70s and 80s and took those reviews instead of useing the ones on their site that were from people doing reviews of the special editions.
http://www.rottentomatoes.com/news/comments/?entryid=19785931% - Return of the Jedi
52% - The Empire Strikes Back
79% - Star Wars
are the respected rateings
Also from the article
****************
As one can see, only Star Wars managed to be Fresh, with a respectable 79% on the Tomatometer, while the other two sequels got successively worse. Most of the critics thought the first film was an inventive, fun, and entertaining summer popcorn movie. It's interesting that they complain about the dialogue back then too. Empire, which is regarded as the best of the series nowadays, only managed to score a mixed 52%. It received great technical grades, but critics had problems with the plot, one way or other, and thought it was just minor entertainment. It got worse with Jedi uneven pacing, no character development, tired acting, and hollow and junky filmmaking. It scored a moldy 30% on the Tomatometer. Prequels were probably the last thing critics wanted back then after the thrashing of the last film.