And besides, ROTJ has been agreed by most everyone to be the weakest of the OT for some time, and the Ewoks is one of the most commonly cited examples of the problems. I didn’t start this reply thinking I’d bring in my own pet project, but it’s relevant; the storyboards for ROTJ that involve Ewoks are often more compelling and exciting than the actual resulting footage, and I think a lot of it comes down to the fairly inexpressive faces of the Ewok costumes. I do not think they lived up to the intentions of the team making the movie, and Harrison Ford’s goofy tone in those scenes doesn’t help.
An observation I’ve made is that you just can’t cast little persons to play agile arboreal creatures. Changing nothing substantial about the costuming, the Ewoks would’ve worked much better if a combination of child actors/average-height adult actors shot through forced perspective had been used to bring them to life.