Saw it opening night, not great, but entertaining. The handheld camera definitely got to me. All in all it was a very cool idea that would have been better in some other medium. However, the viral marketing did its job, as a film with no recognizable stars is about to set a record for the MLK Jr. weekend (not saying too much, but still).
At the very least, the special effects were great, and the monster looked realistic. I liked it, but I don't want to see it again.