She's a popular writer of basically lowbrow fiction. These kinds of authors are always lightning rods for criticism in some way or another. Some people dislike the fact that she seemed to come out of nowhere instead of "earning" her success, but there have been authors like her in every decade for over a hundred years. As far as her "romanticizing" toxic relationships, well, one of the selling points of lowbrow popular fiction is that they do things that seem "taboo" to readers looking for non-moralist escapism. Obviously there is a fine line to walk without tipping over, and Hoover seems to balance the line quite well, as evidenced by her popularity. So every criticism of her books' "problematic" nature are in some way also a selling point for a lot of people. I think her critics would do well to try a different critical tack if they want to curtail her popularity, because the current one obviously hasn't been working.