Almost all of us have been there. Some readers are so troubled by this condition that they can't sleep. Some people ponder. They think. They overthink. They think why they overthink. They agonize. They masticate, chewing who-knows-what in their mental constipation. (Hey! How the hell would I know??!!)
For example, it used to bother me if I gave up on a book. But then I changed my way of thinking, and now it no longer troubles me to stop reading a title I was once invested in. It has absolutely nothing to do with the old maxim that life is too short. For some people, life is too long. Rather, it has to do with what I'm looking for in a book, or what I hope to discover in a book. Much of it, then, has to do with expectations. But I do like my expectations shattered once in a while, especially when reading within the Horror genre.
OK: So what happened? Are you a 'bad' decision-maker? Or just plain lazy? Don't want to challenge yourself? Didn't like the writer's style? Too boring? - (I've encountered that with some modern Sci-Fi. And some Fantasy titles, I might add.) Please feel free to fill in your own reasons.
Constructive criticism and opinions matter, especially if your thoughts resonate with another individual's feelings. Or maybe your constructive criticism will shed light on an issue that that another potential reader hadn't considered, which will cause that person to WANT to read that title. Or maybe reinforce and strengthen someone's feelings on why that person choose NOT TO READ a specific title.