Shaky cam was annoying, but it settles down as the movie revs up- 'documentary cam' doesn't follow the main characters around as the main storyline gets going. It's primarily a device to use epilogue as a prologue, etc. The rest of the movie is shot like 'Saving Private Ryan', etc- some erratic camera movements when things are going to hell, but for the most part not too nauseating. That's how I remember it, anyway- but I did spend most of the time trying to cover Tori's eyes.
Great movie. I felt like I'd had the shyt beat out of me by movie's end, but it really was incredible.