There’s reason to believe this isn’t actually the worst reviewed Star Wars movie (ROTJ and TESB at the time were potentially worse), but that doesn’t really matter. These days the only thing people care about is the score. And this one is a rotten icon (even though it’s on the verge of fresh). These days, that’s a turn off for a lot of moviegoers.
It’s like the PT. Except for TCW movie the weakest Star Wars films have generally been viewed as mixed bags. Yet somehow people just want to hear is it good or bad. The interesting thing is, that I found TROS fun and entertaining, but that doesn’t make it a good Star Wars film for me. While I disagree with RJ’s take, at least TLJ had a consistent vision, and a proper pay-off at the end with Luke’s sacrifice, hence it is the better film for me. TROS on the other hand is just so rushed, and sloppy in its execution.