I'm sure the book is better than the movie. The movie is just straight porn. Fewer connections between characters and those yacht scenes are so unnecessary, it's like cheap porn, seriously. It's just so tacky and awkward. It's badly scripted and I want to laugh when the female lead said "I'm not a bag of potatoes" in her thick Eastern European accent.
I've read FSOG (all three books + Grey's perspective), I can say the book is "intelligent and articulate" rather than the actual films. The plots of the story are consistent and "neatly" arranged. You can find love, erotic, action, emotion, and drama. It has all the BDSM and what not but I still find the movie is much classier than the 365 DNI.
Whoever likes 365 DNI, don't waste your time. Just watch porn. They have a better actress with real boobs and ass, and their actor doesn't have to try so hard. LOL.