What was interesting about the movie was that it took a medicore book and cut out the flab and made it into a somewhat halfway decent film. The best thing that film was did was take out all of Ana's stupid inner dialogue. In the book she constantly makes references to her "inner goddess" when she thinks about wanting to have sex with Christian. It was stupid, childish and horribly repetitive.
Once you take all of that out the whole thing comes across as way, way more mature. What you're left with is an intriguing film about a relationship that straddles the line between abusive and adventurous.