I would suspect that those who voted for...
Owen Wister, Theodore Dreiser, Kafka, just are either nor interested in the subjects these writers pursued or were just not up to digesting their style. The Virginian, An American Tragedy, and The Trial are certainly three books which should be on everyone's reading list. Also, The Jungle (Upton Sinclair) should be read by most everyone.
With that said, the writer who I definitely didn't enjoy Is Virginia Wolf. To the Lighthouse and Orlando are just not my cup of tea, but this doesn't mean she wasn't a good writer.