Not boring, but too many unanswered questions

Rating: 4/10 (5 January 2019)

As my subject heading states, I didn't find "A Quiet Place" to be dull. However, it has so many glaring unanswered questions that I was unable to enjoy what I was seeing. Here are just some of the unanswered questions I had (spoilers ahead): How did the aliens appear on Earth? What was their purpose of coming to Earth? (It couldn't have been just for running amok in the countryside? If the aliens rely on sound and not sight, how do they get around without bumping into things? Why aren't the aliens attracted to the sounds of crickets, rusty swings moving in the air, birds, or raging rivers and waterfalls? If the aliens can't detect noise from humans near raging rivers and waterfalls, why doesn't the family just live next to the rivers and waterfalls? If the aliens are indestructible (as seen on a blink-and-you'll-miss-it newspaper headline), why can they be killed by a shotgun? Why doesn't the family find shelter underground instead of out in the open?
Look, I can accept some mystery and unexplained details in a science fiction movie. But when there is so much mystery and unexplained details as in this movie, the whole package then becomes very frustrating to watch. As a result, I can't recommend the movie despite its original premise, good production values, and professional performances. They might be able to answer questions in the upcoming sequel, but given that sequels are usually worse than the original, I'm going to pass on the opportunity to see it.