These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
YMMV: Iron Druid Chronicles
Alternate Character Interpretation: Hearne takes quite a few liberties in his interpretations of several mythological characters including the Celtic gods Aengus Óg and Brighid. The worst is Thor who goes from one of the most heroic gods in all of mythology and protector of mankind to a sadistic sociopath.
Critical Research Failure: Susannoo and Shango are among the gods named as having been tricked by Thor into not having their stories written down and largely forgotten by the modern world. But Susanno's stories were written down centuries before the Prose Edda was compiled and he has served as a major figure of Japanese religion, art, and culture from ancient times to modern day. The same for Shango in regard to west African cultures and modern religions like Santaria.
Darkness-Induced Audience Apathy: There have been a few complaints to this effect. Atticus, while firmly on the side of good, is more than willing to let a few crimes fall by the wayside in the service of what he views as more significant goals and many many of the gods operate on Jerkass Gods, and get away with it mainly by virtue of being gods.
Hilarious in Hindsight: In Hammered Jesus makes an appearance and fills a street musician's case with money, remarking that bits of green paper are easy to make. U.S. dollars aren't paper, they are actually made of a blend of cotton and linen. So when that musician tries to spend that money he's going to run into a few problems.
It's still paper. Linen paper, cotton paper, silk paper, hemp paper, wood pulp paper, they're all paper. And since it's made magically, it probably would just become whatever it was supposed to be, even if the caster didn't truly understand what it was, especially one as powerful as Jesus is portrayed as being.
Aenghus Og drawing on so much power to open a portal to Hell that it kills the surrounding Earth for like twenty square miles. As a Tuatha de Dannan, Aenghus Og is a druid whose tattoos connect him intimately to the planet. Atticus does not take it well.
Hel showing up in the body of the recently deceased widow Mac Donagh. Another case of It's Personal for Atticus.
Nightmare Fuel: It isn't shown, but Coyote mentions getting eaten alive by Garm, alive and conscious the entire time.
The Woobie: Surprisingly enough, The Morrigan. She hated being a Jerkass God, but all of her attempts to change herself were met with abject failure, so she ultimately let herself be killed.