The ending ruins the entire movie

Rating: 1/10 (27 December 2018)

The entire time we are told that these monsters are extraordinarily dangerous, that they were able to stop everything in their paths. But a shotgun to the head kills them? It's not like they haven't opened their ears before in the movie.
It's basic military tactics to attempt to take advantage of a enemies supposed strength. Is this movie trying to tell me that no one ever thought to overload their super sensitive sense of hearing? Or that no one had a shotgun and shot them before?
Overall just a bad movie with more plot holes than actual suspense.