Hmm, maybe it's because I heard it was a "found footage" movie, and I find those to be kinda dumb. As a filmmaking/storytelling device, I guess I can see it, but it would have to be really well done for me to get past the whole premise that it's real, found footage, but I know the entire time that it's not, that it's a Hollywood production.
The only other example I can think of is The Blair Witch Project, which was reasonably interesting when people actually thought it was found footage (and thus the archetype of the genre?) but once word got out that it was in fact just a movie shot in a new way, I had no desire to see it.