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Back on topic. My nomination is Foucault's Pendulum It's the first book I read that I failed to finish; due to being absolutely as dull as watching paint dry.
Personally, I thought it was fascinating, and had trouble putting it down. But I'm weird, so...
One SF novel I'd add to the list though is Robert Heinlein's The Number of the Beast. If you read Stranger in a Strange Land back in the day, stop there.
The Number of the Beast was when Heinlein started writing his own fanfiction. That's the problem with a lot of his later work,
Friday being another good (bad) example.
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Orson Scott Card had some great books, and some utter and complete crap, with a disturbing air of paedophilia underlying a lot of them.
Anything and everything written by Piers Anthony are best avoided, with the exception of the Aton books, and Of Man and Manta. Incarnations of Immortality starts well, but ends up just being repetitious and dull after the first couple books, and the less said about the writing quality of Apprentice Adept the better. Xanth started out vaguely misogynistic, and ended up being nothing more than an excuse to spew bad puns provided by readers. Everything else of his that I've read (most of it) ranges from disturbingly misogynistic to violently misogynistic. Bio of a Space Tyrant in particular seemed written as an excuse to string together violent rape scenes, and in the Cluster series, he managed to invent an entirely new form of sex
and create a rape scenario for it. Then there was
Pornucopia, which was all about rape as comedy. On the other hand, Mode not only was fairly dull for most of it, with profoundly stupid characters, but even managed to write a profoundly dull rape scene. The guy has some serious issues.