****Possible spoilers below*****
I can appreciate the effort put towards portaying a major disaster from the perspective of a single average person. But to me, the movie also failed in this regard. The characters behaved, interacted, and carried on exactly as I would expect if it was a major studio production with big name actors. The overall movie experience was that of a major hollywood studio trying to imitate a low budget interpretation of a disaster movie. It seemed to be trying to achieve a very subtle effect using an over-the-top premise. And the problem with that is the same as trying to crack a sunflower seed with a sledgehammer--if you don't execute it perfectly, you end up with a huge mess.
I see a lot of "it was really good for what it was". But nobody ever seems to know quite what it was or what it was trying to be. It wasn't a monster movie as it billed itself (because the monster played no role, but to destroy buildings), and as for the filming technique... it felt about as real or authentic as one of those movie rides at Universal Studios. Sure, they jiggled the camera a lot, but that was it. I never felt like I was actually there, or that the footage could easily have been real.
Maybe it's one of those movies that would've worked as a written short story, but as it was I found it to be wholly unsatisfying.