Its not childish imho. Its designed fo children, very carefully designed and characters are rly good enginered. Tales have a variety of characters(mostly) and most little kid can identify him/herself with 1 or more character who has the same problem as he/she.
Its a very good tale for kids and for adults too.
I watched every part of it and its great.
Best episode is Sokkas master. Tai chi sword owns >_<
Downloaded couple of podcasts about the show.
For example the voice actors

Awesome, Momo and the sky bishon has the same actor. (i did'nt knew they had a voice actor at all O.o )
x-Lax:
Why so fanboyish? Fanboy attitude+official "im da authority 'ere, so stfu, IM RIGHT 'n you not" stuff always ends up in flames...
Just a friendly advice for you. This is the cause why i leaved your topic. Its too "official".