50 Shades of what?!??!?!

So, I don't get what all the fuss was about 50 Shades. I liked it ok but didn't love it. The whole time I was reading it I was just waiting for something really big to happen or be revealed or for them to go back in the Red Room of Pain. And when they finally did, she cried, which was a let down for me. I thought should at least give this thing a spin a few times before having a complete meltdown. I guess after all the hype, I expected more. Hopefully it is all ahead of me though. I have only finished the first book and plan on knocking the other two out in the next few weeks. Have any of you read it? What did you think?