What am I missing about 50 Shades of Grey?

So I finally got around to renting it and seeing the movie. Since the movie got so much controversy and great reviews, I thought it should be something that I should watch at some point. Well I watched it and now I want my 2 hours of life back.

I wasn’t drawn in by any of the characters. The sex parts were boring, (like the characters), and the plot was lame. I wanted the driver to drive them all off a cliff. So what was the big deal about this movie? Even for porn, this was lame. What am I missing?