Its bad smut, probably something I would've written when I was 13. I am also someone who has been very active in the kink community and has seen abuse from people that don't understand it. I have also seen master/slave relationships of this caliber as well. I don't let it effect me because it is just a book, it does not reflect the BDSM relationships I've been in and certainly doesn't speak for a majority of very beautiful ones.
Its fanfiction for horny women that know nothing and honestly when I read the book - I was in love with Christian despite him being twisted. I mean we're on a roleplaying site where people will play out their most horrific fantasies. Sure their might be abuse, but I honestly don't get the hate. Do not see the movie if you're against it, its not going to do that well in the box office anyway lol.
I only plan on seeing it because I'm bored and don't do much else.