Midori, I concur with Dukat. If you loved the tv show, don't bother seeing the movie.
Anyways, I personally went in feeling neutral, I didn't really have any expectations, but after watching the the special on nickelodeon, I had more of an understanding for what might disappoint me in the movie. I got out and saw it kinda recently, and I left the theater with neutral. Of course there where things I liked, and other things I didn't care for. But when I left, I made myself kind of a promise. I told myself I wouldn't stop someone from seeing the movie, unless they where in love with the tv series.
I know I'm not the only one who had neutral feelings about the movie, just about all my friends did. But I personally think that, for a M. Night Shyamalan movie. It wasn't to bad (not using as a comparison to the tv series). I liked the costumes, I enjoyed how the kung fu was thrown into the bending, as well as a few other things. But there was things I didn't like about the movie. I'm not gonna go into to much detail. But those where my own personally feelings on the movie.