Whatever Grey is supposed to be, he completely fails at it. If he's supposed to be a romantic hero, he's a terrible one because he's an awful person, a sexual predator who treats his girlfriend appallingly. He also completely fails at being charming. Really, Zapp Brannigan would make a better romantic male lead than him. If he's supposed to be a tortured soul, that doesn't work either because he's too unlikable to be sympathetic. The thing about the Byronic Hero is that you're supposed to like them, or failing that, at least feel sorry for them. And if he's supposed to be a villainous sadist, he's still not a very good one because, to put it bluntly, he's really not all that threatening. Luring a naïve doormat of a woman into an abusive relationship under the guise of BDSM is despicable, but he'd never have gotten anywhere if Ana had a brain and/or a spine. Ramsay Snow would kick his ass to the moon and back.
The only thing these books are any good for is a study-aid in how not to write.