Shin-Chan originally was meant for adults, or at least much, much older children. Dispite the fact that half the theme songs are very childish (and some are outright out of place). In fact, much like the Simpsons, a lot of kids were watching and the show came heavily under fire from Japanese Parental groups. Again, almost completely mimmicking the Simpsons and the antics of Bart Simpson. Of course, the later series and especially the movies were strictly slanted towards a younger demographic.
Well, 12 year old internet girls are probably talking about the show, but they use so much cyberspeak and abbriviations, it comes out as gibberish. 
Oh man, I'm turning this into a bad observational comedy routine.
HM and all that noise is popular mostly for girls 9-10. There are others to speak of, but that's the target audience. When we're talking about people here who are in their late teens, late 20's and so on, you hear more about shows that are important to them. And Avatar is a pretty popular show in its fanbase. Though the toy line must not have done too well, but that's Mattel for you, messing up licencees.
