Lovely, scathing review by Anthony Lane, which contains the following choice extract:

Think of it as the “Downton Abbey” of bondage, designed neither to menace nor to offend but purely to cosset the fatigued imagination. You get dirtier talk in most action movies, and more genitalia in a TED talk on Renaissance sculpture. True, Dakota Johnson does her best, and her semi-stifled giggles suggest that, unlike James, she can see the funny side of all this nonsense. When Christian, alarmed by Ana’s maidenhood, considers “rectifying the situation,” she replies, “I’m a situation?” — a sharp rejoinder, although if I were her I’d be much more worried about the rectifying.

Great stuff! And no I haven’t read the book.