I didn't think this movie was as bad as a lot of people did. It wasn't great but what seemed to bother a lot of people that I spoke to was that it made them really uncomfortable, like the premise was a little too scary to enjoy. People seemed to have high expectations and then got disappointed and turned on the movie and M. Night.
I thought the first 20 minutes was really scary but then it ground down to an "on the run" movie where the characters keep moving and drop one at a time. Not too good, but far from the "worst movie ever made" that I have heard people call it. I've seen lots of horror movies and many of the were MUCH, MUCH worse. After Lady in the Water and the Happening, I hope that Shyamalan gets it together. He had such an auspicious beginning and seems to have bet his life on making movies, it would be a shame for him to continue on a downward arc.