Thanks to the screenplay by Eric Heisserer, that made the movie watchable. Stretching over a span of two hours in some parts the movie feels like its never getting over. This is due to the fact that there's no revelation about the root cause of the disaster also the story really slows down at some points during the time span. Sandra Bullock is one of the attractions of the movie when it comes to sheer performances, and she does really holds her ground. Other than few genuine thrills there's nothing new Birdbox has to offer. Especially when it comes after a Movie like A Quiet Place which is Outstanding!