I'm wondering why one person (under numerous "disguises") can send in so many reviews and Goggle does not notice? It's also clear, from so much they wrote,(each review using the same words, phrases, and expressions) that they didn't comprehend the movie, or what was happening before their eyes. Or they simply hate the Obamas ... which is so lame.
Anyway, let's hope this movie IS totally unrealistic, because the story was horrific. The end of the world, however that may happen, will be horrific. Each character responded in his or her own way, as one should expect. And each actor played their roll very well. I mean how exactly would you react when, in one day, a tanker and several planes crashed onto the beach, yet there was no one of authority to give any direction, for example. All methods of communication were wiped out, people turned against each other (Clay turned his back on frantic woman along the road, Danny became hostile to his friend and client GH) yet the main characters, who started off mistrusting and resenting each other, ended up becoming "family". Yes, we are indeed left with a lot of questions ... that's what makes a good story.
Don't avoid watching this movie. It may not be THE best one you have ever seen, but it will (or should) get you thinking.....