Most of the stuff John K. worked on before The Jetsons reboot in the '80s.
According to Word Of God, the Earthworm Jim cartoon series was the product of Executive Meddling—the game creators were coerced into making the show in order to support game sales.
Chuck Jones once said that if he were allowed to he would burn the negatives to every Looney Tunes short he made before 1948. The one short that seemed to get the most contempt from him was "Elmer\'s Candid Camera".
And the Powerpuff Girls episode "Equal Fights", citing that the subject of feminism is to strong for a childrens' cartoon show.
Carl Barks, Don Rosa and some of the 9 Old Men grew to hate the animated show Ducktales. For not being true to the stories that Carl Barks wrote. As well as taking away TMS's time away from Little Nemo (infact, 2 of them (Frank Thomas and Ollie Johnston) did work on Little Nemo just so that they will work on something that was out side of what Disney was dishing out at the time).
Maurice LaMarche hated working on The Popples he is quoted as saying each recording session made him want to vomit because of how sickeningly cute the show was.
Trey Parker and Matt Stone feel this way about the first three seasons of South Park, as Parker states outright in a 2011 Entertainment Weekly article: "It's just embarrassing to watch".
In fact they hate season 2 so much that they didn't even do commentaries on the DVDs like they did for the other seasons.
John Erwin, the voice of Filmation's He-Man, is said to not particularly enjoy talking about his time on the show. These reports come not from co-stars but from anonymous internet posters who claim to know him.
Steve Moncuse is really unhappy with how the Fish Police cartoon, in which he had little involvement, came out. He said in one interview, "the less said about it, the better."
