I haven't, as yet, found anything about how good or bad they were.
Ewoks made 35 episodes, from Sept. 1985 to Jan. 1987.
Again, nothing about how good or bad they were, but one thing I read the person compared it to the Smurfs.
The Ewok Adventure (Caravan of Courage) was a direct-to-TV movie shown in 1984 (I think I heard it was on CBS, but I'm probably wrong about that).
817 voters at the IMDB give it an average rating of 5.1 stars out of 10.
The Battle for Endor was also direct to TV, in 1985.
815 voters at the IMDB also give it an average of 5.1 out of 10.