A few lesser things that annoy me about live action atla:
The soundtrack. The classic orchestra style doesn't match the world they are in.
The animals don't have a personality and make no noise. Appa & Momo are lifeless.
Narratives are changed so turning points and key character development are nonexistent. (Aang wanting to turn back during the storm to go back home) (Sokka not learning a lesson in respecting women) (Katara lacking her maternal nature which comes across as overbearing at times)
All in all it both feels too serious and is still somehow set up as a show for all ages. It's hard to stay interested.