for some odd reason, i feel the need to defend shymalan on this. he wanted to write momo out of the movie because momo's not really integral to the story. and other than being comic relief in the show, he's really not. but of course everyone still wants him in it. also, shymalan's apparently a huge fan of the show and was the one who approached the creators about making the movie. you should watch his interview with mike and bryan on the book 2 boxset.
i'm still not sure how i feel about this movie, but i'm choosing to be cautiously optimistic, and i am planning to go see it. at the very least, it's good because it'll most likely help lead to a second avatar animated series