Let me begin my review by saying that I logged into IMBD for the first time in my life in order to rate and review this film, I hated it that much. The spoiler free version is this: It relies on tired tropes and has little in the way of concrete horror or fulfilling thriller.
From this point on, this review will contain spoilers.
The Disappointments Room is a run down festival wherein the carnies are made up of overused, overworked and unfulfilling tropes. Tropes are not bad, they're the cornerstone upon which humans build their media, not a single book, movie or game exists without some use of them. And yet The Disappointments Room manages to use every single one of the tropes that movies, especially horror movies, absolutely need to let die. It felt in a way like an exploitation film that did not want to admit it was an exploitation film. While they aren't particularly beloved by me, at least films such as Hostel or The Saw Franchise know what they want to be, and strive to be that. The Disappointments Room is a confused mess that can't decide whether it wants to be a ghostly horror, or a thriller, and it suffers deeply because of it. Right away the film launches into the usual introduction of a family pet only for that animal to die for a purpose that serves neither to deepen the horror or to move the plot along.
I know why films do this, humans empathize with animals quickly and deeply and because of this killing off the family pet was once a swift way to gain audience emotion, however, it has been used to the point where at the very least, I myself cannot bring myself to feel anything about it other than apathy, the moment an animal appears in a horror film we all know what's going to happen: That animal is going to die for sure. And this is no exception, the death of the family cat provides nothing in the way of emotion or importance and therefore serves as nothing but an unsuccessful attempt at shock value. Yawn.
The scares are few and far between if you can even call them scares at all, there are a multitude of characters who exist for no other reason than, well, they exist, their place in the plot is unnecessary at best and detrimental and distracting at worse. Even the husband, who should have had at least some bearing on the plot exists as nothing more than a two dimensional paper doll who exists only to give the wife someone to, at the very end of the film, cry into the arms of after having a rather exhausting breakdown during an unpleasant to watch drunken dinner scene. Which brings me to my next points.
The main character of this film is struggling with depression and very likely PTSD, whether on purpose or on accident this film very strongly implies that people with mental illnesses or who have survived through some manner of trauma are dangerous, scary, and should not be allowed around their own family for fear they'll have a mental break and attempt to murder them whether they know that's what they're doing or not. Admittedly this is becoming not only a worrisome trope but also an incredibly overused and badly played one, it goes beyond being simply offensive straight into the realm of being all at once boring and painful to endure. And this doesn't even begin to touch upon the as usual overplayed trope that physically disfigured people are scary and that women are weak. Don't get me wrong, I'm the last person on earth to scream that something is misogynistic, but parts of this film simply scream Misogyny to me, from the portrayal that women are physically weak, to the portrayal that they're mentally weak as well and are simply one life tragedy--usually involving domestic things like children--away from snapping and throwing a fit during dinner. The use of 'accidentally killing her own infant' as backstory was also sudden, and unnecessary to boot, the film simply did not know what story points it wanted to run with, and because of this, there was simply too much happening for all of it to be resolved, leading to essentially nothing being resolved.
If you like watching the family cat be mutilated, and you want to hear all about how people with depression are scary monsters who shouldn't be around normal people, this is the film for you! Otherwise, you'd be better off watching a campy straight to DVD horror that may be bad in the end, but at least will be an Entertaining sort of bad.