Angels and Demons and the Da Vinci Code. Read both all the way through. Wish I hadn't. They were strongly recommended to me as something I'd like which is why I persevered.
Automated Alice, Jeff Noon. Didn't finish it.
Something terrible by Poppy Z Brite. Can't remember the name, but it was awful. Serial killer in prison manages to pretend to be dead to escape. Slices people up, something about HIV. Worst book I ever read, didn't finish. Really, worse than Dan Brown.
The Firebird by Susanna Kearsley. At least I only paid 99p for it.
Obligatory mention of a much loved classic - I do not get on with Pride and Prejudice. Have tried on more than one occasion. It bores me.
@Theducksarenotmyfriends
Slugs by Shaun Hudson (I think?). It's about 6 inch killer slugs, with one tooth.
Never heard of it, but sounds like a nightmare I had when I was about 8. The slugs were rabid in my dream and they buried themselves, before poking their heads out to bite you with their tooth.