It depends, many people are investigating and researching about BDSM and what it is all about. BDSM (at least in my country) is a major taboo. People who practice it are thought of as sick and twisted. I read an article in which an organization was asking people to boycott the movie and instead of go seeing it, donate the money to organizations against domestic violence.
When I do agree that violence is disgusting against a woman, BDSM is completely different as most (and yes I said most, not all) of us know. It's sane, safe and consensual. None of our practices go against the submissive's wishes and if by any chance we are pushing them too far from their limits they have a safe word to use and let us know.
I don't know yet how well made the movie was and this was a fanfic written by someone who has never practiced BDSM before in her life. Which is why I rather have a book from Cherise Sinclair made into a movie.
Maybe it will help open some people's minds regarding BDSM, maybe they'll think Christian Grey is a twisted mofo... who knows? We cannot control what others think about what we do like, enjoy and find pleasure in.
I do understand that Christian in the books is kinda pushy with this whole thing, which is not really how it goes in the BDSM world. You discuss getting into the lifestyle usually with someone who you are with not a rule tho of course. But the trust here is a 2 way street. So this "boycotting" because BDSM is domestic violence is just IMHO stupid, All of what we do is consensual, is talked about before a scene, whether in a cub on in private. Whether your a sadist who loves inflicting pain or a masochist that gets off on pain, all of what you do and get done is talked about before. Is not like we want someone to come out of nowhere and punch us or be the punch giver just because we get off that way. There are, unfortunately, twisted fucks who claim they are sadistic dominants and they don't give a rat's ass about their sub... Which give the BDSM community a bad fucking name.