The classic Nickelodeon cartoon Avatar: The Last Airbender was hailed as groundbreaking at the time of release and has inspired a loyal following, and its sequel series The Legend of Korra was a well-received maturation of the property. However, there have also been many lows–an awful movie adaptation, a divisive live-action Netflix series, and innumerable bad video games. This week, things are finally looking up. The movie Avatar Aang: The Last Airbender appears to be the Aang Gang reunion fans…