The Last Airbender
The Onion AV Club gave this movie an F, so you can imagine that my expectations were low. It was far worse than I could have feared.
Worst acting and writing I've ever seen in a movie - and I pride myself on the number of ####ty B movies I've watched. The Last Airbender is a joke, although it only offers a handful of laughs derived from this catastrophic failure of a screenplay. When I turned off The Lady in the Water 45 minutes in, in appeared that M. Night Shyamalan was losing any talent he once had. But seeing Airbender, I think Shyamalan is on heroin.
Airbender isn't just bad. It's bad in a way normally reserved for The Plague or syphilis. The Last Airbender and everyone who made it are a ####.
		
		
	 
	
		
	
	
		
		
			Last Airbender  - Had to see for myself. Not as bad as I envisioned, but bad. (The  Happening was worse than this though). Lot of money up on the screen,  but the script/acting/direction are all DOA. No life in this movie at  all, simply an excuse to jump from set piece to set piece and CGI  effect to CGI effect. That's not always a bad thing, but here it's just  plain boring. Given what I've read about the animated series, this was  a real missed opportunity.
		
		
	 
I saw this recently out of curiosity.  I needed to see why this was the most universally panned and lambasted film of the last decade.After seeing it I was kind of shocked at all the hatred directed towards this film.  The acting is definitely bad* (more on that in a minute) and there is too much exposition and not enough storytelling.  But people are treating this like it was the worst movie ever made.
I wanted to understand why.
First off I think the 3-D really hurt this film, if you can't film in 3-D then you shouldn't add in 3-D post production.  It's uncomfortable on the eyes, distracting  and seldom looks good.
While watching I noticed that something seemed to be off with all the actors, not just Noah Ringer who has wicked moves but had never acted prior to this film (doesn't he deserve a little slack for that fact?).  I finally realized that all of the actors went out of their way to limit the movement of their eyebrows.  All of them.  In every scene.  It was so prevalent that it could not be simple coincidence and must have been at the specific direction of Shyamalan.  This, coupled with pedantic dialogue, drained the film of almost all emotion.  I thought it was so odd I felt compelled to look into it further.  I figured it must relate to the actual cartoon in some way. Perhaps, I thought, this was how the characters in the cartoon were.  I needed to know.
So I spent much of the last week watching season one of the show and here is where I began to truly understand why people hate Shyamalan's adaptation so very much.
Beyond the story changes, things included or omitted from the series, he directed all of the joy out of the characters.  All of it.  Every last drop.  The cartoon characters are vibrant and intensely emotional at almost all times.  Aang is really a merry jokester who wants to avoid all true responsibility in this life and just seek adventure (the show is clearly just a backdrop for teaching childhood lessons).  He is a person of action and readily jumps into almost any situation with exuberance.  He also seldom, if ever doesn't have a smile on his face.  Shyamalan turned him into a troubled, indecisive fop, a pseudo-Frodo who carried the same pained expression on his face for all nine hours of LotR.
And it is pretty much the same thing for every character in Airbender (although Dev Patel managed the rage and drive of the mostly one dimensional Zuko).
But the answer to my question of why Shyamalan would make the decision to have his actors so lacking in expression (something like this doesn't happen by accident) still confounded me.  Then I saw the last episode of season one and I think I found an explanation that fits (even if it is ultimately not the actual motivation for Shymalan).  At one point in the series Aang (during the final battle of the movie and series) must travel to the spirit world and in the series he must confront the Face Stealer.  He is told by the spirit of Roku (the Avatar before Aang) specifically and in very clear terms that in the presence of the Face Stealer 
his face must never show any emotion whatsoever or his soul will be stolen.
I think Shyamalan grasped onto this concept, perhaps misguidedly thinking it would be a nod to the Face Stealer, who was left out of the film.  Or maybe he saw it as an inside joke that only true fans would get.  If that's the case, he could not have been more wrong.
Or perhaps he was so concerned at the completely inexperienced lead actor that he instructed everyone to limit their range in an attempt to hide Ringer's flaws.
Any way you cut it, the lack of emotion from the actors truly doomed this film.  Even the same simplistic story portrayed by actors applying joy in their performance reflective the the characters upon which this story was based would have made this a much better film.
Ultimately the film is kinda meh, lots of action, good CGI, fast moving.  A typical average popcorn flick.  But by no means is it as bad as all that.
As far as the animated series is concerned I strongly recommend that anyone who has children maybe 6 years and older to let their kids watch it.  There is lots of action but little actual violence (GI Joe style without guns), there is an important childhood message written into every episode and most importantly they teach that actions have consequences and true achievement requires dedication & discipline.  It also has a very wry sense of humor, not for consistent adult viewing but good enough to get a good chuckle or two each episode.