Nice show indeed.
Aang was younger, was the last of his kind as a bender, and the world at war for 100 years was a really great plot.
As for Korra... we have to wait and see what a "modern" city can be challenging for the master of all elements.
for now... Totaly Ninja!! :)
Loved it...
I just hope this series will follow the steps of some really good animation series based on "old" stories, like "Green Lantern: The animated series"