I don't know, ROTJ lacks the feeling of ANH to me, it often feels lazy, stilted and operating on auto-pilot. The plot is tired, the dialog is tired and the actors often look like they would rather be doing something else; the chemistry was lost. I think the big difference is that it was still featuring the same people we were already in love with (Luke/Hamill, Han/Ford, etc) and had a story with enough action, effects and occassionally good scenes (the throne room) and occassionally good dialog (Lawrence Kasdan) to get by. But it's basically a proto-prequel, IMO, when I allow myself to step back from my own nostalgia and look at it more objectively. It's definitely better than a prequel, but as I said for me this is mainly because I cared already about Luke and Han, but Anakin and Padme had to earn my love.

Personally, I find that TPM has the same combination of magic imagination and bored acting that ROTJ does.