Ebert goes in on Shyamalan's The Last Airbender:
The dialogue is couched in unspeakable quasi-medieval formalities; the characters are so portentous they seem to have been trained for grade school historical pageants. Their dialogue is functional and action-driven. There is little conviction that any of this might be real even in their minds. All of the benders in the movie appear only in terms of their attributes and functions, and contain no personality.
Chris Orr's review here.
I still defend Unbreakable.