Totally agree. I think when they mention works that are deemed masterpieces as the worst book, what they really mean is either
A. Why is this book so critically acclaimed? I've read better.
or
B. I didn't care for the author's message.
BTW, one of the worst books I've read is The Devil Wears Prada. A friend gave it to me to read on the plane. It was a hell of a flight. Didn't know she hated me that much.