It's interesting that the OP and I were exactly the same age (11) when we saw Jedi in '83, and yet our opinions are wildly different. I love Jedi and while some parts, I agree, could have been done better - I enjoyed it immensely when it was released and felt it was a fitting end to the trilogy. None of the OP's criticisms ever crossed my mind in '83. And Leia's bikini? Yeah that had an effect on my 11 year-old brain.

One more thing - while Wookiees instead of Ewoks would have certainly been cool, it brings up other problems since Wookiees weren't primitive - they were space-faring and already allied with the rebellion. It would have been a completely different movie, beyond simply replacing Ewoks with Wookiees, is what I'm saying.