I'm interested to hear more about why you hate this book.
On a purely technical level, the book is an example of very poor writing. It's wordy, it meanders, it's full of was and adverbs. In terms of narrative, the book is over a thousand pages and tells a story that could have been told in better depth in a few hundred. It goes on for pages and pages with gun descriptions that would look overlong in a technical manual and descriptions of gore that become boring rather than shocking purely due to their length.
On top of this, the book falls into a category of literature which is possibly the lowest form of writing. It seems to exist purely as the author's personal wish fulfillment. It is fairly obvious, in fact, that the novel's protagonist is little more than a clone of the author himself, made into some kind of superhero and given all the cool stuff, women, and riches that the author has always wanted. Wish fulfillment is one thing, but when wish fulfillment involves torturing and murdering people and feeding their severed phallus to a pig it becomes something deranged to boot. The novel is a power fantasy in which the author imagines himself imposing his will violently on others using his lovingly detailed guns. And of course he has no trouble at all doing this. One man with his .44 Magnum takes on all of the united states government and not only wins but wins very easily, which is of course so ridiculous as to be outright comical, except I think the author actually believes it.
On a moral level, it's worse, because I can't come up with any reading of this book that doesn't condone terrorism in our own country. The hero assassinates democratically elected officials for political reasons and to frighten other democratically elected officials into surrendering to his demands. That's not just terrorism -- that's Terrorism vs. American Democracy: Terrorism wins, and wins gloriously. This is what the author fantasizes about happening -- not court victories, not democratic victories, not victories in which the villains are exposed and lawfully punished for their crimes, but violent victories through terrorism, particularly featuring himself murdering the people he dislikes most. We even have a scene in which the hero forces a man, under threat of torture, to read a statement condemning the hero's enemies before he is murdered and hacked apart.
This is exactly, 100%, what Al Qaeda does to people. Why isn't this obvious?
You mention racism. I'll go further and say John Ross multiple times presents black women as a caricature more filled with seething racial hatred and bigotry than an 1860s minstrel show. He indicates his disdain for ATF agents by presenting them as a ghetto black woman named Gonorrhea which his self-insert tortures and murders. That's so utterly backward that for that alone this novel could be read right along with the worst racist literature and fit in comfortably.
You mention the sex but I don't even remember any sex. I only remember rape. Graphic rape with relatively little to do with the plot or the characters. One rape scene occurs "off screen" when its implied that the protagonist rapes a congressman's corpse after murdering him, with the goal of making it look like he was killed by a gay lover, which also adds homophobia to the list of themes presented in this novel.
Finally, one image I recall strongly from this novel, especially now, is a finale in which the protagonist heroically approaches an unarmed, unprotected female politician, shoots her in the face, and heroically strides off into the sunset. All I can think is Jared Lee Loughner probably would love this book, if only it wasn't sold out and hard to find.
Taking all of this into consideration, I find the most atrocious part, perhaps, being that this novel is regularly presented as a must read for gun owners who want to be respected and regarded as responsible people. It's a novel that presents the American gun owning hero as a terrorist, an assassin, a rapist, and a racist, who gets a weird power trip and sense of invincibility from being a gun owner. I'm sorry, but we can do better than that. We can do much, much better than that.
