Good production value.

Good acting, for the most part.

Entertaining, for the most part.

Bird Box would likely have been better received if it was released further after A Quiet Place.

The antagonist is a mystery, and the film doesn't attempt to explain it beyond what the characters can imagine. The "criminally insane" become allies with the unsympathetic "force". I've read that some viewers proclaim it stigmatises mental illness, however, that was not my impression. The only mention I recall from the movie was that these people were "criminally insane", like a person incapable of human empathy, imprisoned for a heinous crime. The film doesn't mention "mental illness" at all.

The opening sequence was sensational.

The secondary characters have their purpose in the film, albeit small and seemingly insignificant. They each added flavour to the film, even if it's just for comical relief or a sex-in-the-pantry scene.

I don't think the film attempts to deliver a message about society. It does attempt to entertain, thrill, sadden, and offer a somewhat happy ending. I think it delivers what it intended to, and I'll give 7 birds to this box, I reckon.