Though I usually hate yandere types and of course have a strong disdain for people who have a strong tendency for...unwanted sex, like Ashley, I disliked her at first as well but playing through the game she got a hell of a lot better and fits what Runey is trying to do. I see where he's coming from, if you look at the behavior of all the girls in the hotel as is, they all fit a certain personality, if we applied her personality to anyone else you'd feel the same way and like the "new Ashley".
tl;dr you don't hate Ashley, you just hate the personality she has but it's necessary part of the game as each girl stereotypes a personality.