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.
Growing the Beard: The first book in the series is reviled by some, considered average by most, and loved by a few, but all agree that this book was a huge improvement on the series as a whole and the beginning of an upward trend in the writing and storytelling quality. The plot begins to become more focused with various plot points coming together, things are happening on a larger scale and with a faster pace, the humor is more tolerable, and it is simply far better written overall.
Moral Event Horizon: After Ortega mentions he would feed on children and some of the actions Bianca took, it seems like the Red Court couldn't sink much lower. Wrong. To kill a small number of White Council wizards recovering in a muggle hospital, they had human mercenaries release a nerve gas in the hospital killing thousands.
Rewatch Bonus: A good reason to re-read this book is that it becomes clear how sneaky Lasciel's shadow was being, all the time she posed as "Sheila".