The original and prequel trilogies are worthwhile viewing. The sequel trilogy, however, presents a different case. While George Lucas provided story treatments during the 2012 sale, these were ultimately discarded. The sequels also marked the end of the Expanded Universe, removed from canon to allow creative freedom for filmmakers. Given that the stories deviate significantly from Lucas’s original vision, is there really a compelling reason to watch them?
Regarding The Last Jedi - I agree that it tried something different, and that wasn’t a bad approach. What killed it for me however was the amount of slapstick and Marvel-esque humor. Star Wars always felt like mostly serious movies - sure, there was always goofy stuff like the trash chute monster or Jar Jar, but all in all they had the air of movies that take themselves seriously (probably due to the space opera nature).
TLJ was the first movie where I didn’t feel any of that. The first scene basically took a shit on a beloved character by way of cheap slapstick, and that never stopped.