I haven't ever touched 50 Shades of Shite, because I could see from the way it was trailered that it was going to be awful!
I used to belong to a book club and one of the books was We have to talk about Kevin. I managed to read a couple of chapters, but it was such laboured writing that didn't seem to go anywhere that I had to stop. It could have been a good book about the difficulties of dealing with an autistic (I think) child, but it just wasn't.
I did try reading Twilight, that's the only book I've ever actually thrown across the room! Mum wasn't impressed, since I narrowly missed hitting her with it, but she managed to read less of it than I did, and I didn't finish the first chapter! Another in that vein was the first Game of Thrones book, it sounded like it might be interesting, even with the constant deaths, but no.
I actually quite like the Dick/Felix Francis books, true they're not a patch on Dick & Mary's ones, but as stand-alone books they're not bad.
ETA: corrected Dick Francis' son's name, I thought I knew it, then reached for a book which happened to be one of theirs and realised I had it wrong!