Okay, I feel the need to explain just why James Patterson is so hated by librarians.
See, it's not just that he writes mediocre, churned-out thrillers; there are many, many authors of mediocre, churned-out thrillers out there, he ain't special.
It's also not that he "writes" them with "coauthors" and slaps his name on them - again, this is not unique.
It's not even - though this is starting to get there- that he chases every publishing trend and creates His Version of everything from Diary of a Wimpy Kid to Nicholas Sparks, which nobody likes as well as they like his thrillers but still buy because they have His Name on them like a summoning charm.
No, what makes James Patterson uniquely loathed is the combination of the frequency of publication and his popularity. Because, to be honest, I'm not sure that anyone even likes his books anymore, but it doesn't matter, because if they have the James Patterson name on them then readers will be queuing up like zombies desperate for a fix of decaying cerebral matter. Which would be tolerable if he had the decency to only write one book a year like most other bestselling authors, but "James Patterson" (quotes VERY intentional) puts out roughly two books per month. So as a librarian, not only do you have to buy every new book James Patterson puts out, you have to buy multiple copies in order to fulfill demand. Somewhere around 5% of my fiction budget is spent ENTIRELY ON JAMES PATTERSON. Every new James Patterson that comes out means a dozen or more queer romances, inventive sci-fi novellas, unique cultural viewpoints, etc, etc that you can't buy because YOU HAVE TO BUY JAMES PATTERSON INSTEAD. (See also, you just weeded and shifted the Ps in fiction to make room and now it's full again oh god why.)
And the clincher - the absolute clincher - is the knowledge that the publishers will be "finding" "unfinished manuscripts" by "James Patterson" for a minimum of fifty years after his death, so even if some right-minded bibliophile with a claymore takes one for the team, we will never, ever be free.
And that is why we hate James Patterson.