The more I review, the more I have to refine how I think about the story. I love it when language, situation, and plot all come together, but it doesn't always. I have to identify what's gone pear-shaped. Gone are the days when I could wave my hands and say oh that didn't work for me.
This list isn't complete, and it's in no particular order of importance. I've tied to remove identifying characteristics. The book with the issue may or may not have been reviewed here, and may not be m/m. But whatever it was made me grit my teeth, probably more than once per story. In possibly more than 1 story per week. If the mood strikes, I may expand on items in this list for future posts.
Have your characters fail to notice something overwhelming, unmistakable, and unavoidable.
Have your crushed, broken, mutilated hero, who might need to be on life support, be ready for hot monkey sex.
Have your MC turn into a blithering idiot when love interest is in peril.
Have your professionals be oblivious to doing what they are supposed to do best, with or without peril involved.
Fail to capitalize Deity.
Fail to provide a beginning, middle, and end to the story. Even if it's short.
Have your entire huge project brought to a halt because a non-essential team member gets incapacitated.
Make the story encompass huge chunks of time where nothing happens, for no obvious reason.
Be gratuitously nasty toward women in general.
Promise something in the blurb that the story was never meant to deliver.
Ignore the laws of physics. Paranormal/fantasy has some leeway here. Contemporary doesn't.
Save the day with cavalry coming over the hill if cavalry has not even been hinted at being in the story.
Make a big deal out of some person, attribute or object that turns out to be totally irrelevant.
Use words that are out of place for the setting, time, or character.
Use words that have specific meanings in ways that have no connection, or that are indelibly associated with a particular book or movie.
The Great Wall of Text.
Twitching cocks. Pulsing assholes. Enough precome to submerge Cleveland.
What general situation did I miss that annoys you readers?