Avatar: The Last Airbender -- one of the greatest Nicktoons of all time, only more different; it was more action-packed and much continuity. In fact, it's a stunning masterpiece, even for 2005. It has amazing bending sequences, action scenes, funny and heartwarming moments, comedic reliefs such as Sokka, brilliant voice acting, and vibrant anime-inspired character designs and animation, courtesy of such studios including DR Movie, JM Animation and Moi Animation...something Nick didn't have before. It lasted 61 episodes over three seasons -- or in this case, "books"; the last book, Air, would be used for The Legend of Korra's first season. It helped change the face of Nickelodeon... and then came 2008, when it ended with a bang. The network then focused more on funny sitcoms, wacky Nicktoons, and acquired programming including those from DreamWorks Animation (which would be effective by 2013, when Paramount gives up its distribution of their films to 20th Century Fox, which in turn was succeeded by Universal in 2016--but that's not the point).
In 2010, we were given an Avatar movie (no, not your Avatar movie, James Cameron).
It was simply called The Last Airbender -- and it was, to no surprise, a box-office disaster. Try to compare that with the beautifully wonderful minds of creators Michael Dante DiMartino and Bryan Konietzko. Yeah....
The biggest problem is that it's M. Night Shyamalan helming the project. It didn't retain the inspiring things the show had. All it did have was acting that ranges between absolutely tedious and obnoxiously hammy, bad name pronunciations to make them sound more Asian, to the fact that the actors and actresses AREN'T from Chinese/Japanese descent (Aang's name is misspelled as "Ong"), weak character personality and lack of development (Aang has no experience of fun, Sokka's comedic traits are removed, Katara is bad at Waterbending, and that Katara-Aang ship has sailed away), lousy "fight scenes" (which look like dancing more than fighting; the "pebble dance" scene, which IMO is more funny than action-y, to name one), and too much exposition. Oh, did I forget that the characters are whitewashed? The plot is based on Book 1, but so many plot points--some major!--had to be removed, creating what is very obviously plot holes. Besides the fact that the cast never watched the show before, or probably never heard of it, there's also the abysmal 3D conversion.
Aang's adventures were already done in the show, so there's also no reason to continue his story.
Sorry, M. Night Shyamalan, but your recreation of Aang and friends are so shameless, uninteresting, and rather nonexistent.