I believe the director did worse than any of the actors, used a Spanish pronounciation guide instead of an Asian one, and shouldn't have aimed for the 3D approach for every scene, and should've had the special effects people take it easy on the air, making dust, snow, & mist/ Fog effects for airbending.
Only Cowboys & Aliens will show us if Noah Ringer is a good child actor,
Stupid Director making the characters speak in a way no human would, just so translation would be easier...