Not only is ESB a contender for greatest film of all time, ROTJ is not beyond redemption. Gamorrean Guards alone make it worth it, and it's got some peerless action scenes: Rancor Pit battle; Sand Barge battle; Speederbike battle; Final Luke-Vader showdown.
I even love the Ewoks. The only really offensive bits are the burp jokes and Death Star 2.
And The Last Crusade was pretty great too, so maybe Lucas should have quit after '89?