Sometimes you have to just go with the premise of the story. But i can't help but wonder how these aliens made it from the still, quiet depths of space to hunt down earthlings with no other useful sense other than hearing. Perhaps they were unleashed by a more intelligent lifeform to do the grunt work. I can understand the attack on major cities. But it didn't makes sense for them to just pop up out of nowhere in Jerkwater USA. And as reckless as these creatures were, it didn't seem plausible that they were so stealthy before showing up. Seemed like they could have been easy pickings way beforehand. These creatures were not technologically a threat to cause such a disruption to human life. Noise could have easily been used as an advantage.