Fifty Shades of Grey.
Jesus, that was unreadable. I love how the author made ~70% of all conversations to be emails, probably because she couldn't write proper dialogues.
The dialogues during descriptions of sex scenes are worse than some porn dialogues on free websites. Inner monologues of the main characters are cringeworthy as well.
The story lacks focus and direction, and the main character is just terribly uninteresting (was this on purpose?). The second main character fails to be interesting, because besides his emotional issues, which are the entire point of the story, he is perfect in every other way, which really strips him of his humanity and prevents you from connecting to him, or identifying with him (as a male reader).
There's first person narration, but it clearly proved too much of a challange to write properly for the author.
One of the very few books I wasn't able to finish and I didn't even try the next two in the series.
Twilight Saga was an enjoyable read compared to that.
Why is that book a bestseller, I cannot tell. Only because of the spicy controversy?