The movie as all movies are, a visual to show and relay an experience in visual form, of things or people reacting or just moving along a given situation or circumstances in a scene. A good movie, stands out by actors or actress who portray these characters in realistic fashion. For this, Bird Box is a good movie as good and believable acting carries in an admirable fashion of the story of normal people overcoming conflicts and fear to survive a life threatening situation of an unknown deadly force. It's this experience that we get to enjoy in this movie that makes it a good movie, regardless of the ending or explanation needed.