I caught it from both ends. I had players that hadn't read the books and weren't interested in coloring within the lines as it were, and I also had players that thought the DL novels were the greatest contribution to literature since Shakespeare. Both groups annoyed the other, and to boot I would get constant lectures from the latter about backstory, NPCs, motivations, etc.
I've heard of others that have had similar experiences with FR, but fortunately never had to game with people that were seriously into those books.
Novels are slow poison to campaign settings.