A few years ago, I watched all of Avatar: The Last Airbender, a show on Nickelodeon. It is a kids show, but I enjoyed it nonetheless.
Some kids shows are boring to an adult audience because they are very heavy handed with moral themes. I remember watching an episode of the animated remake of Sabrina the Teenage Witch. I liked the original series, but the remake sacrificed plots and nuances for monologues on why you should listen to your parents or something. I read an excellent article in the LA Review of Books' blog