I saw this yesterday and thought it was a very serviceable horror movie but felt like I'd seen it all before. And that's the problem, I've come to the conclusion that horror films (like new rock bands) are for the young or the uninitiated now. I still enjoy both those things greatly but it is very hard to surprise us old bastards anymore and why should they?
POSSIBLE SPOILERS
I thought the monsters were 'a bit stock' :Alien xenomorph: big teeth, no eyes, pig squealing Check,
Predator - face that opens up, clicking noises Check See also Life, War Of The Worlds , The Mist, Signs, Super 8, The Thing remake
Where do these post-apocalyptic people get their electricity from? The power stations would be unmanned and you couldn't run noisy generators because they would attract walkers, blind monsters, mutants etc.