For me it would have to be any of the books in the "Flowers in The Attic" series by V.C. Andrews
The first book was pretty meh but each book that followed got worse and worse, and my sick need for closer made me power through them.
The woman can't seem to make her characters evolve at all. The way they are written when they are 11 are the same way they are written when they are 36.
She loves ending ever sentence in exclamation points! To the point were they lose all effect.
She also writes every character as a complete whore or a sick stalker who can't move on with their lives.
She also falls into the trap of making characters impossibly beautiful, every single character needs a 9 sentence paragraph describing how wonderful they look. This would not be that big of a deal but they do it 15 times for every character. If you took out character descriptions all her 200 page books would be 5 page pamphlets about being overly dramatic.
Wheel of Time. W O W. It continues to stun me that people love these books.
After book 3, it was downhill fast. In a red wagon. With graphite on the axles and a greased slope. Actually, probably right off of a cliff. All passengers plummeted to their deaths, I do believe.
Also, I have not read Twilight - but any series that has a 3rd book which has repeatedly been summarized to me as 'pedophilia, bestiality and an abusive lover is just not the 'teen series' for me. Or, preferably, any teens, but I digress.
Jane Eyre. Fuck that book. It was an incredibly boring, somewhat cliche, overall shitty book. I don't give a shit if it's a "classic" or if it won any awards. I don't know how it did it. I hated every single character, I couldn't go past one page of the book without falling asleep (which is reasonable because one page of the book contains about 10000 words). I mean, I've read some pretty boring books for school but that just takes the cake.
I know a lot of you are going to think I'm crazy, but I hated Of Mice and Men. For one, it could not hold my attention. I'd been reading Stephen King and Michael Crichton for eight years by the time I had to read Of Mice and Men, and I just couldn't get into it because there wasn't enough suspense. I felt the same way about The Great Gatsby. I don't care about the intellectual merits of those books, such as the allegories and the symbollic undertones. I read books for fun, and I think if you put too much emphasis on analyzing the themes and metaphores of a book, it turns reading into a chore and takes the fun out of the experience.
Plus, those books kind of gave off this vibe that people should give up on their ambitions, because they will ultimately end in failure. Yeah, those books sucked.
Try reading something by H.G. Wells. All the literary merit without the boredom. :) I don't see classics the same way as yourself, I liked Of Mice and Men (never cared for Gatsby) but I understand where you're coming from. A lot of writing nowadays is very cinematic in structure and imagery.