What makes for a bad horror ending?
I've heard so many say that they enjoyed books like the The Deep (Cutter), Last Days or most Adam Nevill, but the ending really didn't do it for them. Last Days seems to be a notorious example. I have never heard any positive opinions about the ending, but it's odd that something can start out as everyone's favorite and then drastically decline in quality. I still have yet to read it because I've heard so many bad reviews so I don't know where it fell off at, same for a lot of books that are mentioned or reviewed as having bad endings.
What are your general, or specific, opinions about horror endings? Where do you feel like a lot of things fall flat or decline in quality? I have a feeling that, for a lot of very divisive endings, such as I'm Thinking of Ending Things, the author gets too ambitious. Completely changes the tone, changes the rules of the universe or story, shoehorns too much mystery, too much abstract. or the author otherwise really drops the ball confusing resolution for problems going away, people ending, etc.