It's nice to see a show with a Chinese American character as the main star really take off. There are some cultural elements to the show, such as when she takes a trip to China to visit "Gu Nainai" or the Lunar New Year episode, or the mid-Autumn moon festival one. (In the trip to China, Kai-lan and her friends get to visit and hold a baby panda! Totally unrealistic, but it's TV after all). Other episodes are just about being nice to friends, sharing and expressing your emotions. (One of my son's favorite phrases right now: "I'm saaaaad." Which I am positive he learned from watching Kai-lan).
I wasn't sure if this show would be successful, but I meet kids all the time who say (or their parents say) they like the show. Their kids won't be fluent in Mandarin, but that's not the point. They'll be able to pick up some phrases.
*This post has been modified because for some reason, half it got erased, and I had to recreate the latter half from memory. And my memory isn't that good.