I saw Star Wars a few days back for the first time in several years. I never considred the film a masterpiece but it was a lot tackier than I remembered it. It would be unfair to comment on the special effects but the acting and and dialogue are fair game and they are quite bad. Only Alec Guiness gives a good perfomance. Several of the exchanges between Hamill,Ford and Fisher are excruciating and most of the Imperial sidekicks are awful as well. .
I think the last few years have raised the bar when it comes to acting and dialogue in blockbuster films. LOTR is excellent of course but even X-Men and Spiderman are better than Star Wars. In fact the recent Star Wars films , or at least AOTC, aren’t really that bad compared to the originals. It’s not so much that the Star Wars films have gotten worse but that some of the other blockbuster films have gotten better.
Having said all this I wouldn’t say the original is a bad film. The basic story and characters are still memorable ; it’s just that the scene-by-scene execution is often quite poor.