For me, there are categories I just walk past and don't even open and others I actually search out. stories for example, of which there are thousands and that's perfectly fine, just not for me. I guess there is a reason there are thousands. People like to read them (and good for them).
Regardless of category, some stories start out great, have excellent character development, etc. Eventually the Author just doesn't know when to call it a day. So sex scene after sex scene becomes repeated over and over again with very few activities ever changing. What might have been a fabulous 4 chapter story, ends up being 8, almost as though the author decided ahead of the game how many words or pages they were going to write. I'd rather read a great story and be furious at the end there wasn't more to read, than have to shut down a story 3/4 though due to rehash.