I just bought the books and haven't started reading them, but I've watched the movies and I absolutely love them. I don't see the movie as porn. Porn is strictly about nasty sex in every form possible, there's generally really no storyline.
Fifty Shades movies have a love that develops and ends with a changed man and a martiage a children. It's a romantic movie with a lot of sex and S&M but it's not like it's over the top. They never show Christian full frontal like porns do show everything. I have seen one porn movie and that's enough for me. The movies are a beautiful love story that changes 2 people so they make compromises that are vital for any healthy relationship.