Pretty good, but not the best.

Rating: 6/10 (21 February 2019)

I really enjoyed the majority of Bird Box, but a couple of things let it down for me. Firstly, it feels quite long. This isn't always a bad thing, but in this case the last 30 minutes really started to drag, and I think it could have benefited from a 90 minute run time.
My other issue with it is that we never actually see the monsters that are causing the suicides. The ending of the movie seems like it's building up to show us what they look like, but it never happens. I understand that this is intentional, and it could be argued that it would be impossible for the audience to see them, as every character sees them differently; they see whatever thing would drive them to suicide. However, there's concept art online for the monsters, and the design is really great, so it's a bit baffling that they never show them.
Other than these two issues, the movie is actually really enjoyable! It's tense, with some scary moments, and there's a constant feeling of danger. The characters are also written and acted well, and the relationships between various members of the main groups are interesting to see develop.
Overall, Bird Box could be better, but it could also be a lot worse. Give it a watch if you have a couple of hours to spare.