Are you interested in a high fantasy setting with original characters and a murderous plot? Well then I've got just the story for you! It has dwarves, magic relics, a dragon, etc. Does that sound like the kind of story that might interest you? That's too bad, because I wrote it in sixth grade, and it's not very good.

My point is that a book might be in the genre you care about and still be garbage. However, if a book receives positive praise from reputable sources (e.g. authors you like or critics you respect), then it might be worth reading even if it's not in your favorite genre.