Sesame Street is one of the best and longest-running kid's tv shows of all time. The Sesame Street characters have become embedded in pop culture and mass consciousness. Big Bird, Bert and Ernie, Oscar the Grouch, Grover, and the omnipresent Elmo are just some of the characters roaming the neighborhood in Sesame Street.
My favorite characters are probably Cookie Monster, SuperGrover (Grover's superpowered alter ego), and The Count. Kermit the Frog, in my mind, doesn't count since he was the star of his own show The Muppet Show, but he's made many appearances on Sesame Street over the years.
Is Sesame Street educational? I guess. It's fun, inviting, and non-threatening. And it has many fun kid songs, so that's enough for me.