Even on rewatches, the show is powerful for me. There are two episodes that will always make me at least tear up. I would almost hazard to say it is a perfect show for youth. Even the youth qualifier feels shaky sometimes.
Just to add in, an animated show I have rewatched a lot that still inspires me is "Ping Pong the Animation". I recommend the original voice work for the initial run, especially if you understand Chinese. They recasted one of the characters for the bluray release, and the delivery is not quite right in my opinion.
Tales of Ba Sing Se & Sozin's Comet, Part 2: The Old Masters? ;)
Half right! "Tales of Ba Sing Se" and the very next episode "Appa's Lost Days", which apparently won a Genesis Award for Outstanding Children's Programming [0].