If you are going too use this mechanic, be consistent with the rules! There were numerous moments in which the film seemed to ignore the logic set within the previous scenes. As first, the quietest of noises can alert them and bring monsters to the location of the noise virtually immediately. Knowing this, the characters continue to do things that would risk creating great noise. I won't go through them all but the most offensive moment, and I'm sure the idea was that it was a 'dumb thing to do', was the boy deciding the run through the cornfield and somehow surviving. He should have been mincemeat, noting how quick the monsters appears after the 'nail fiasco'. Similarly, but less offensively, the woman screaming in pain (perfectly understandable in childbirth) would surely have been insta-death noting the proximity of the monsters to her (even taking into account the fireworks going off moments before). Then they start running around all over the place when its unnecessary to do so, including the boy leaping into the stationary truck. Kind of took me out of it, I must say.
Similar to the above point - I was irked at people doing silly things. The aforementioned cornfield run was ultra dumb, but the most silly was the suicide of the lead male. All the alternatives he had as opposed to just standing there. Why not run away from the car, make a noise then hide? I don't know... again, seemed odd.
The start of this film, post-title, was mind-numbingly slow and was mildly irritating. Anyone who has ever watched any post-apocalyptic film may as well skip the first 30 mins, which added virtually nothing, certainly nothing that led to any emotional payoff later on.
The 'method to kill the monsters' was so obvious from the moment you saw the radio shack that the rest of the film was me just waiting for that obvious resolution.
Jump scares were jumpy but cheap. I don't even dislike jump scares, but 'dead silence' then 'loud noise' is just jump scares are their crudest form, I'm afraid.
The was it ended the film, on that cliffhanger, was irritating and unnecessary.
