I had my hopes, but as soon as I stepped through the theatre doors, took my seat, and watched katara narrate Aang as AUNG, I was in for a crap-coaster of a ride...luckily their were 3d effects and other disappointed faithfuls in the theater with me, otherwise I woulda' been outa' there faster than Mike Tyson in the 1997 match against Holyfield, you know the one...
Anyways, the cast was all Americanized, but what could you expect from Hollywood these days, with such great examples of mass market media like Twilight, or anything out' Disney that WASN'T a cartoon( don't get me wrong, I liked Mall Cop, but Beverly Hills Chihuahua? C'mon!!!) They couldn't even give Dante Basco his role as Zuko, any body remember Hook? Rufio, Rufio, Ru-fi-OH NOW I GOT IT!!! He can fight! Ugh...
But I don't blame the market, I don't even blame M. Night Shama...lama...lan, I blame myself for having high expectations. it's a good kids movie after all, but it's based on a GREAT kids TV show...
My advice? see the movie in theaters, so that you don't end up buying it for a friend later,( you'll probably lose the friend along with the 20 bucks...) Or at least wait for the sequel in order to think, "huh, I wonder what I missed in the first movie"... but don't take my word for it...