Put me down for an agree on Wuthering Heights - what horrid characters. And everyone having the same name! The only thing that has ever redeemed it for me is the Thursday Next novels by Jasper Fforde - he puts them all in therapy.
I have a different problem with Wicked - I really enjoyed it the first time I read it, but I've never been able to get all the way through it a second time. It goes well for me til the final section, then it just falls apart completely.
My most loathed is Kafka. I loved The Metamorphosis, so I decided that my senior year high school English paper would be Kafka. Compare and contrast several works by one author, look for themes, etc. Well, I didn't know going in that Kafka never finished anything, and was a completely paranoid human being. I wrote a scathing evisceration of the works, and my teacher loved it. At least I got an A out of struggling through The Trial, The Castle and Amerika.