I picked up this book because an English major friend of mine said it was the most difficult book she ever read. I agree, but its difficulty lies not in any depth of thought or high artistic value; rather, this is an exhausting, dull read and I quickly grew to hate the characters and the author's writing style.
I read somewhere that it is a grave mistake to use foreign language phrases more than once or twice in an English language text. Perhaps it was in Strunk and White's "The Elements of Style". I wonder if they were speaking specifically of this book. On an average of once per page there is a German, Latin, or French phrase inserted in a dialogue or, even worse, the narration, and it isn't like these phrases are well known. The sole purpose of these, in my opinion, is to further obfuscate a work that is already so desperately trying to be well-known for it's complications.
As for the characters, I'm not asking that an author make any of their creations lovable, sympathetic, redeemable people. But the self absorption and self-importance of these pathetically deluded people was not only obviously contrived but ultimately served no real purpose.
Do yourself a favor. Avoid this book. If you want to read a writer that willfully but highly successfully buries the meaning of his writing under layers and layers of abstraction, pick up the works of Dylan Thomas and let the enigmatic beauties of his poems unlock themselves for you at the most inopportune times.