Is it the endings that put you off on RotK or more than that? I love the film overall but can understand criticism of it more than for the other 2. One thing I really didn't like was the way the (awesome) Battle of the Pelennor Fields ended, as if the whole lead up was a waste of time! And what is the Land of the Teddy Bears? Sounds amazing!

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Edit: oh Ewoks of course haha
Edit 2: If Ewoks had been replaced by Wookies in RotJ I think it would become my favourite. The combined ending sequences with Luke/Vader/Emperor, the space battle and Han & co on Endor are just crazy when intercut together like that.