Books are a lot like people. Some people you like immediately, others you have to learn to like. And still others, they ain't for you. If you belong to several book clubs like I do, we are exposed to many genres and writing styles.
Like people, some books are slow starters. Others lose me in the first chapter with too many characters to keep track of. Some are much too detailed--I don't need to know about each rain drop dripping from each tree. Some are poorly crafted, confusing, contradictory.
A good book gives me an experience that I won't forget.
I just finished a book that I liked very much (Me Before You).The book before that, not so much. What do I do with the latter--well I apply my "Page 89" theory which is simply with any book I may have in hand, I read until at least Page 89. If I'm not into the book by then, I prioritize my time with something else. In the past, books outside my reading genre that I gave up on by reading only the beginning, I've found later to be worth reading to the end especially if it's a club's selection.
Our club coordinator had asked one of our members who had been absent for the discussion what she thought of the book. She said she'd stopped on Page 89. We all laughed--we knew exactly what she'd thought of the book!