I'm going to start out by saying that I personally saw Avatar: The Last Airbender from start to finish. Amazing animated series, but now with a very not-amazing movie. You know something is going wrong when the first few sentences being spoken pronounce the title of the show incorrectly. Then you know its even WORSE when you find they pronounce the HERO's name incorrectly. It's Ang! A+ng! The story itself technically was accurate, but it all was done extremely choppy. And the ethnicity's for 2 of the groups were mixed up; water benders should have been Indian, fire benders should have been Asian. Apart from these details, the acting in my opinion was also lacking, but it didn't help that the script seemed very lacking as well. The ONLY good part about this movie were the visuals. The CG was great.
To those who saw the original series: DON'T see this movie. All you will do throughout the entire movie is just cringe at "AHng" whenever he's called out, and in general point out all of the flaws.
To those who haven't: You still may enjoy it, but be prepared to be a little confused. Things aren't described well enough for those who don't know whats going on.