Honestly, I just get tired of the same old shit. Admittedly, I put out “the same old shit” myself from time to time, but I try my hardest to push and evolve my stories in new directions, with mixed results, but I try. What bothers me, is when writer’s stop trying. I can tell when someone is in a rut–maybe they like the rut! That’s fine too! But if I can see a new story from someone, and know right away where it’s going to go, then I’ve just lost all interest. I want to read stories that surprise me, that send characters in directions that are unexpected. I get super tired of wish fulfillment. No one in a story should get everything they wanted.
This general thing is what bothers me the most, for sure. It’s difficult to describe in any clearer words, but that’s the gist of it. I’m bothered by writers who seem content to rehash more than innovate.