I have read the first book and am in the process of reading the second, though currently taking a long break from it
. It's really poorly written - in comparison with it 'Twilight' series reads like Shakespeare.
I don't think the main protagonist Christian Gray is a narcissist. First of all, his family loves him - including parents, sister and brother. Not typical for narcs. Secondly, he appears to care about women he used to sleep with, though he is not interested in seeing them anymore - again, narcs devalue and discard, and that's the end of it. He is capable of having long-term relationships (e.g., with his former older lover) and he seems to deeply care about Ana, though in his own special way
I do think that many who were attracted to a narc in real life, can see a parallel with this book in the sense how someone may feel irresistibly drawn to someone who is bad for them. The dilemma is whether to stay in a relationship that is harmful for you and suffer or break free and lose 'love' or 'spark'. I haven't read the trilogy fully, but it looks like Ana leaves Christian in the end.