I've read a lot of mystery/thrillers over the years (I even run a mystery/thriller book club) and have found that I can predict a lot of what is going to happen. I have found myself going in with low expectations and will get a three to four star out of the book that way. If I go in anticipating loving it, I'll hate it. There are also certain writers in the genre that I avoid because I just don't like their writing. My co-book club lead and I have been adding other types of mystery books (fantasy, cozy, romance, sci-fi), horror and true crime to our monthly polls so we can keep our participants interested. It's been a good way to stay in the mystery genre but also branch out a bit more.