Didn't care much for the shakey cam; it was making me a bit seasick.
I could almost envision the meeting where someone said, "We need to do something like Doctor Who's 'Blink,' where the main characters hardly appear at all." The difference here is that in "Blink," the character's connection back to the Doctor was important. Here, the boys weren't important at all, really, and I just didn't like or feel sorry for the trio of hipster filmmakers.
So, I appreciated the effort, but I really would rather see Dean and Sam. I also liked how the credits started at the end, as it was still the beginning of the story, from the guys' perspective.
But overall, MEH.