No real story line. Why are these things so scary when any amount of coordinated fire kills them.
Why aren't tanks or armoured cars wiping them out?
Why do I care about the characters?
A year in and the monsters just kill? They don't eat us? How many could have made it to the earth on a flaming comet? Reproduction rate? Environment limitations?
Why isn't this more like 28 weeks later and develop the world so we can stay interested?