Technically, Invisible Man should not count, because I did once read the entire book; it was an AP English Literature assignment, so I had little choice, but it was probably the only novel I read for school that I absolutely hated. Plus, I will always remember the time it helped me win a Quiz Bowl competition (Never forget -- Invisible Man and The Invisible Man are two different books).
As I've mentioned, I'm making an effort to infuse my reading with more diversity, and generally I've found that to be a really rewarding challenge. And certainly I would agree with most high school English teachers that this is a book Americans should read But because I've already read it, I can be smug and complain about how little I enjoyed it. Naturally, a book that seeks the dramatize the African American experience in the first half of the twentieth century is not going to be a laugh riot. It's not just that the plot is plodding, joyless, struggle, but that the writing reflects this; because our nameless protagonist is treated as an "invisible man" by the world around him, he lacks development in a way that is frustratingly effective. It completely succeeds in its assertions about being African American, but as a result, it's incredibly tough to get through. Sometimes struggling through a difficult novel can be a really enriching experience, and often stellar African American literature is the best example of this -- Beloved is gut-wrenching, and there were so many times I had to put it down and take a break, but it absolutely deserves all the praise it has received and more, and Toni Morrison's incredible prose really eases the pain. Ralph Ellison is not trying to make this easy for the reader, however; the difficulty is the whole point. So in the end, I'm glad I read it and now I never have to read it again.
Books I Can't Even (apologies for the use of Internet cliches) is a recurring post on books I absolutely could not finish, usually after several attempts.