Serious faults with this film

Rating: Null/10 (17 June 2018)

Whilst the film started out well ie atmospheric tension built well, I soon discovered a major flaw which undermines its principle premise of the family not being able to talk with each other. Why on earth can't they whisper in each other's ears? Then all the ridiculous gesturing and pseudo-sign language becomes redundant. The lethal creatures out there don't react to the gentle shuffling of human feet on the floor, walking through vegetation etc, gentle whispering has an even lower decibel count than these and would not attract a lethal response.
I got as far as Emily Blunt stepping on the nail in the wooden stair tread, then thought this so ridiculous that I ditched the film. How come there is a big nail suddenly sticking upwards at least an inch out of a stair tread when the family will have been up and down those stairs endless times prior? And for a nail to be sticking UP means it was hammered from below, another totally implausible idea. And the idae that this was a bent nail which was straightened upwards by her pulling on the caught bag doesn' work either, a nail that size/thickness would not un-bend so easily. When she went up the stairs the bag she was carrying had caught on this nail and, stupidly, she just yanked on the nail to free the bag. Another stupid action which common sense dictates you would not do given the scenario of needing to keep totally silent.
And the momentary glimpses of some long-limbed horror creature is dumb also, much better to have not shown the source of the killings of people and of animals, the human imagination works wonderfully when things are not obvious but hinted at.