I really enjoyed it. Not as scary as Blair Witch, but pretty damn good. The "jump scare" ending was kinda lame, though. The whole movie was solid gold, up until the ending, which was just a cheap scare, IMO. Allegedly it was Steven Speilberg who decided to change the ending in the editing room.
There were two alternate endings that were being screened before release, and I tend to like one of them better.
Here's one of them:
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That said, according to the movie studio, they're giving the director of this a 5 million dollar budget to film a similar handheld camera film regarding two people sneaking into Area 51.