Call me fussy but there are certain things I want from any and every story, regardless of genre.
1. Intriguing characters.
2. A life or death situation (this can be life or death in the literal sense or a character making the proverbial mountain out of a molehill but it is still life or death to them).
3. Dialogue that rattles along.
4. A sense of place but not too much physical description, please. I just want enough images to form a vision of the whole thing but a few telling details are enough for that.
5. When the story ends, I'm sorry because I've loved being "with" the characters.
All of the above is why I read in and out of my genre as I love to find out how other writers achieve these things. And it has added considerably to both my online and physical bookshelves!