I never had a problem with the Ewoks.
There, I said it.
OK, so they were cute little merch opportunities, and the Ewok glider (when FFG, when) was ridiculous, but yeah. Kids mostly loved them.
And RotJ is much, much more than Ewoks. It actually provided a thrilling and satisfying conclusion to the Original Trilogy, with Han's rescue, the Biggs's space battle in the series and Vader's redemption.
The only thing bad about RotJ is the excessive post release CGI tinkering from Lucas. Jabba's palace dance number, changing Anakin's force ghost, galaxy wide celebrations etc.
Disney would right many wrongs in my opinion with an original theatrical cut re-release of the OT.