I'm a sucker for environmental horror
I really liked this film. I liked the main reporter, I liked the widow who survived at the end. I really liked the gruesome practical effects.
I even liked that it was done in "found footage".
I thought the doctor in the hospital was the best character. He's the only one who really sold me on the scenario.
The scientists outside of the catastrophe were alright, but I felt that Chris Denham (who starred in "Sound Of My Voice") didn't really get a chance to shine. I thought the little girl video messaging her friend (played by Tara Polhemus I think) did a pretty great job with what she was given.