I wasn't allowed to watch Sesame Street as a kid because my parents felt that the only thing Sesame Street teaches you is how to watch television. Based on what little of it I've seen, I can't say that I entirely disagree. It's much less educational than I think a lot of people think it is. However, it's probably harmless enough in a society where TV is inescapable. It's not inappropriate for children, it does teach some basic things and some basic lessons about tolerance and being good to other people. It could be much worse.
I had a professor in college who hated Mr. Rogers, another show I wasn't allowed to watch because my parents didn't think I should watch TV at all, really. I don't get why you'd hate Mr. Rogers though. My professor thought that he had taught the youth of America that they were special, like that's a bad thing. Old people who dislike the idea that younger people might possibly have identities are a fucking trip, man.
Other than that, I don't really have much to say about children's educational television at the moment. I'm not sure why I have even that much to say.