Lots of holes, but I agree, as a sci-fi movie it is what is to be expected. Pure sci-fi. No psyco babble/action movie/mystery movie. Just good old entertainment. What I also liked, was that in the end it was just natural causes that destroyed Earth. No political sway about humans destroying themselves, in the end, we were just extinguished. Nice change of pace.
Now as for surround sound, yeah Baby. It about shook the house down during the subway scene. My family and I were staring at each other with wide open eyes. They finally "got" why I set up the surround sound.
Why on earth they didn't go with 7.1 I'll never know. Our H/K receiver matrixed it fine, but true HD 7.1 would have been soooo cool.