You may notice a number of reviewers whining about "agendas" or "the political left" when airing their grievances about the film, often followed by 1 star reviews and a number of "helpfuls" lodged in the counter below.
And...yeah, there is an agenda here. It's the same agenda that has been a vital part of horror movies since the very beginning of film: social commentary as laid out in some of the worst fears of human imagination. Whether it's commentary on the family unit in films like The Shining and The Babadook, or commentary on the sometimes torturous struggle in coming to terms with homosexuality in Nightmare On Elm Street 2, horror movies work best when they expose real fears and attach them to the extremes of our imagination.
Expecting a horror movie to have no perspective—subtle or explicit—is nothing less than a complete misunderstanding of what horror movies are at their core.
That said, much of this, I would argue misplaced criticism, can be laid at the feet of a somewhat clumsy script and rough plot. Themes or commentary should never be outright stated, but rather woven into the actions of characters and details of the plot. There is a marginally deeper meaning here that is rather obvious well before the final moments are revealed, but the ending is still impactful in a traditional horror sense, if not as effective commentary then certainly as a horror film.
And ultimately that's what matters. There are messy bits here and there left unexplained and which seem to serve no real purpose to the plot or the development of its characters, but it's easy to overlook when the film is still effective in bringing the scares.
One criticism that I personally have to levy at the filmmakers involves the couple themselves. I'm a straight white male in his thirties, but even I am tired of seeing gay couples who are presented as promiscuous or in open relationships. It's to the point now that if I see a gay couple presented in media, 19 times out of 20 it can be expected that one of them will cheat on the other, or for them to be sexually promiscuous in ways that present them as being "other" to hetero relationships. This just seems wrong and honestly, offensive, even to a straight white man who is not typically offended by such things, to put it mildly. I've never been in a gay relationship, as a result of my aforementioned laser-like straightness, but people are still people whether they are gay or straight, and this disparity in their presentation has started to be very noticeable.
If you can get past the somewhat heavy-handed script and creative flaws in the story's construction, you'll find a well-made and effective horror movie that succeeds in where it counts: an unsettling story told effectively.