I dislike mysteries or thrillers that are mostly preparation for a big shootout or fight at the end. Actually I don't read many thrillers anymore except legal thrillers and even then only if they're more legal than thriller.
I'm not particularly bothered by violence in a book but it's not nearly enough to interest me and if it takes too much time I lose interest.
I'm also bothered by stories that require me to intimately understand physical locations and settings. I never really do understand them that well and I get confused. I have a very poor sense of direction. I wish I could figure out where I'm going with this.
Barry