I recently read Gabriel Garcia Marquez's Autumn of the Patriarch for a book club. This book soon became known to participants as "the paragraph." We called it this because there are no absolutely no paragraph breaks, and sentences go on for pages. Pages.
It's possible a University of Toronto representative will show up at my door any minute now to revoke my English degree, but I can't stand books without proper punctuation. I know, I know, some allegedly great works of literature feature the stream of consciousness style that throws the rules out the window, but as sentences go on and on and on, my eyes glaze over. I don't mind a little creative license with style, but we invented periods for a reason!
James Joyce's The Dead is a lovely novella. However, you'd have to pay me (quite handsomely) to read his Finnegans Wake. Pure biblio torture.
So what's your least favourite literary classic? Honestly, give me a good romance any day. *g*