They are the only prequels we are going to have so we might as well make the best of them and unlike the OT there is so much that people aren't precious about so they can be a useful testing ground/learning experience for people new to the game.
I've seen some PT edits that really improve things and some of the ideas on the Radical Redux Thread show genuine promise.
As for the OT ROTJ has almost as much wrong with it.
I can't imagine anyone even suggesting some of the ideas for changes for a film like ESB.
And that promotes imagination.
So in a way Lucas' mis-steps get the little grey cells firing more because they were such a let down.