It always annoys me when people say: 'yeah the first two sucked, but I really loved the third one.' ROTS is even higher rated on rotten tomatos than ROTJ! Nothing happens in ROTS!
Nothing happens in ROTS? You only have the rescuing of the chancelor, the killing of Dooku and Grievas, the revelation of Palpatine's former master, Anakin turning to the dark side and becoming Darth Vader, the killing of the jedi order,the republic becoming an empire, Yoda fighting Sideous, the big battle between Vader and Obi-wan, the birth of the twins....
Yeah, nothing really happened in that movie.
ROTJ had a long period where it dragged with the ewoks. Plus it just seemed like a rehash of ANH except with a more elaborate way to destroy the death star. It wasn't all that.
I really don't have a problem with TPM. For me AOTC was the weakest of the entire series. Of all the movies, the only ones I even care to rewatch again are ESB and ROTS.