The Great Gatsby. God, that book was horrific. The most amazingly dull and unreadable piece of tripe I ever had to refuse to finish reading. Even the Cliffnotes were unbearable.
Catcher in the Rye was probably the lousiest of the books I did actually manage to get through.
Animal Farm, 1984 were the best books I was assigned.
Qwinn
Animal Farm had the added advantage of low page count!