Ewok's get a lot of shit. But their actual concept - the idea - is not totally flawed. A cute cuddly creature that can turn on you, go nasty or kill you could have been interesting. But the execution in Return of the Jedi was so weak, watered-down and half-assed. Leaning way too far in to their cute nature with almost none of their primitive animalistic side (distrusting of Leia and remember they were about to roast, and presumably eat, Luke, Chewbacca and Han). Add to that the family-friendly movies based on them which further made them more bland and emphasized the 'cute' (which they never really were) and they become a much hated part of a much loved series. I'm going to blame Rick McCallum, Richard Marquand and of course, George Lucas. Half-crazed unstable primitive cute animals if executed in character something like a modern day bobcat or baboon troop could have worked. But sadly, in the end, all we got were the bland loving teddy bears that everyone hates. So my point is, they still could work if someone has the balls to follow up the original concept and do it right.