The messages spread throughout all 3 seasons are important ones and i love that they are being aimed at the younger generation in an epic and exciting way. I love that for once a kids show shows that there is no single race/nation but that there is good and bad in all of them and they we are responsible for making the world a beautiful place. I also loved how in tune with nature this show is because i find that in an age where we are losing everything that is natural it is important to teach children to stop and look at the world around us and see how spectacular it is!
I recommend this to kids AND adults because some adults could definitely learn from the messages in the show! I have admit that i am heartbroken to have finished it but this show will always be a favourite of mine! I recently came back to this series after watching the Legend of Korra and finding it pretty bad. Maybe Avatar was always bad? I was just younger at the time the Last Airbender was airing? But no, after a total re-watch of all three seasons, this show is cemented in my mind as one of the best animated shows to come out of the west (with the help of the east) ever!!!
The characters are all well realised and, with the exception of the occasional tertiary character, fully three dimensional. This is helped to an enormous degree by the animators, who nail the characterizations with great animation. That's not to say the show is perfect. There are occasional bad plot choices or even entire episodes, but they are easily overlooked as the story is so engaging and fun. This is a wonderful series.