I saw this yesterday and was completely taken in from the start. I felt like part of the group. The camera shaking didn't bother me at all; I actually liked how it was handled. Also, nice work to the sound department for an amazing job. Even while wearing earplugs, I could tell the audio was incredible.
*SPOILER*
What bothered me the most was when the group is at the military triage center they seem to completely forget about Marlena and her serious condition. It would have made more sense to first get Marlena the care she needs. Instead, this scene of the movie is handled very "Hollywood-like". Marlena is absent for a minute or so while the group tries desperately to get military personnel to help them rescue Beth. Then Marlena is back on screen and by the looks of her you know she is going to die soon. How they handled it (usually) works fine in the movie world, but for this type of film it wasn't entirely believable.
Still, it was a very good movie that gave me a feeling no other movie ever has. Go see it!