I liked Return of the Jedi. I always enjoyed that and Empire more than a New Hope (though I liked all three)
What made the first star wars trilogy work in my opinion was how music driven it was. Obviously the effects were very important too, because you need to believe in the world being created, but it was the very simple human drama and adventure cast starkly through music that always won me over with it. Even when they got the same crew together for the prequels, there was quality music there by John Williams, but I think something was missing from the experience (and I think the newer films too don't quite capture this either for me). I think maybe there is just a difference when something come out, it is new, and forging new ground, and when it becomes more self referential and a brand. But I am old and have old tastes