Not bad in a bubble but when you compare it to the original, the new Netflix adaptation skips over too many plot points. As a result, some aspects of the story are changed and not for the best. The CGI in some areas, especially Appa's hair, looks terrible and under rendered.
I also can't make myself believe some of these characters are dangerous or strong. The actors for Azula and Zuko, in particular, are baby faced. I cannot understand why folks are saying Zuko or Azula where acted well either. Sometimes it looks and sounds like characters are reading off of teleprompters. Aang and Katara also struggle with this problem. Super stiff.
The original Nickelodeon series still holds strong. While this Netflix version isn't as good, it is at least better than the live action Avatar movie.