I haven't read the entire book, but I've read like 10 pages of Fifty Shades of Grey when my then-girlfriend was reading it. Besides the story and subject matter, the writing itself is horrible.
Never read it, just some parts here and there because a girlfriend was reading it and it was hilarious LOL The descriptions are supposed to be sexy or alluring or god knows what but they are so cringey! It took me a bit to understand that my friend was reading it seriously.