I read The 7 1/2 Deaths of Evelyn Hardcastle, and take enjoyed it. Read another book, then started reading Devil and the Dark Water by the same author. I got about 25% through and just decided to drop it for something else. I'm not an avid reader so i never know if I should stay committed or not.
The best way to do that is to select your next reads by relying on your own previous reading (that gets easier as you read more), or on the opinions or recommendations of people that know you very well or have very similar tastes.
I haven't abandoned a single book in years. The few times I was tempted to throw something aside, it was because I was misled by hype (and comparisons that seemed promising but didn't deliver), or - most commonly - because someone gave it to me as a present.