While it's not exactly the same thing, negative fans that won't let go reminds me of this: "Why Star Wars fans hate Star Wars" - when you get right down to it, people feel betrayed by the unrealised potential in things like this. I wouldn't be suprised if many of the fervent anti-fans of Anita are people who liked the idea and style of the first novels, wanted more of that, and feel betrayed by what it has instead become.