Very confused why this movie is a hit. Holes in storylines make it very hard to concentrate

Rating: 1/10 (23 May 2018)

--If they can talk and scream near the fall, why don't they just move their home there and be able to talk?
--For super sensitive hearing animals, the scientists in this entire world didn't even think of changing sound frequencies to fight them?
--If an ordinary rifle gun can blow the head of the monster and really kill it, why would the world be wiped off by just three of them?
--and so many many many holes....how did you guys manage to not be distracted?