All of this is subjective dude; you outta know that. Personally I don’t see how anyone could make the case that ROTJ is better than SW or ESB but hey, that’s their opinion. No one is really right in this situation even if you bring forth a stronger argument.
+1. There’s no such thing as “blah blah blah is an objectively better movie”. Scientific facts are objective. A piece of music, a painting or a film on the other hand is entirely subjective.