Some magic requires emotional discipline; other magic requires emotional intensity. Mara's complaints are that the specific spells discussed in the book are the former kind, and not the latter.
The Unseelie Accords book is an overview of the major factions of the supernatural world: the White Council of wizards; White, Red, and Jade Courts of vampires; and Summer and Winter courts of Sidhe. It compares their variations on a few axes: language, geography, view of regular mortals, and culture/general mode of operation.
Several factions have official languages: Latin for the White Council, Etruscan for the White Court vampires, Spanish for the Red, Classical Chinese for the Jade, and English for the fae. The White Council and Jade Court speak their dead languages alongside the local vernacular and push them in official communications. The Red Court mostly communicates in Spanish during day-to-day life and official business alike, though there's a significant minority whose first language is Portuguese; likewise with the fae, English, and Gaelic.
Some factions are associated with particular geographic spheres of influence. The Whites (both Council and Court) trace their origins to Greece and Rome, and have a modern-day sphere of influence centered in North America and Europe. The Reds trace their origins to the Mesoamerican civilizations, and rule over Latin America with an iron fist from the Rio Grande down to Patagonia. The Jade Court's capital has followed that of China; currently they're based in Beijing. The fae operate almost exclusively out of the Nevernever; insofar as they can be said to have a terrestrial geographic origin at all, it's theorized to be in the British Isles.
The Reds and Jades view regular humans as prey animals to be hunted, the White Court vamps and Winter Court fae view them as livestock to be managed and protected from the wolves of the world, and the wizards view them as part of their ingroup (it's a misconception, the author says, that the Summer Court do as well; actually, they're in the "livestock" camp, it's just that they're vegans). The author goes on at some length about the question of whether supernatural beings can be considered "human"; the traditional view (shared by everyone, though with different emotional valences attached to each side) is that wizards are and everyone else isn't. However, the author explains, there's a "yes" and "no" case for just about everyone. Even wizards (those who have so thoroughly practiced their magic that it's unlikely to ever atrophy, in any case) vary so significantly from baseline humans in their molecular processes of healing and aging as to be potentially considered a separate subspecies. Vampires (with the exception of the Black Court, who are true undead) are human-demon hybrids, and the demon half can be indefinitely deferred from predominating, or in some cases even killed. Many fae, notably including the Queens and Knights, were once fully human before their acceptance of a magical mantle. The only unambiguous nonhumans are the lower-ranked fae.
Each faction has a distinct culture and set of abilities, which informs the safety rules for interacting with them. Technology is useless against wizards, who tend to fry it. Avoiding physical contact is essential with the Red Court, as their bodily fluids are addictive. The vampire courts in general, especially the White Court, operate on a "power behind the throne" basis, with it being seen as cringe to take open action rather than manipulating a catspaw. When it comes to the fae, essential practices include a keen awareness of exact words, good habits around debts and promises, and not calling them "the fae".