My initial review focused a generalities rather than lore so I'll throw some lore now.
+ One thing I really liked about this book is we get a sense of how apocalyptic a Blight normally is and how lucky Fereldan was to escape one lasting longer than a year. OTOH, I'm wondering if the damage to Fereldan is worse off than we gave it credit for. A good quarter of the country is covered in the Darkspawn by the end of things and then there's the Mini-Blight consisting of the Broodmother's rampage. It might be that Fereldan isn't going to be anywhere near recovered in Dragon Age: Inquisition.
+ I also like the depiction of the Grey Wardens in this book as both Garahel and Isseya are willing to die or give up their lives to stop the Blight with no complaining. Not only is Garahel the guy who takes the final shot against the Archdemon (which we know) but Isseya knows Blood Magic is something which will accelerate her Calling but sees no problem with it. They're committed to destroying the Blight and don't have any illusions being a Warden isn't about sacrifice.
+ I was surprised to see the reference to the Broodmothers in the book as I thought they were a new thing that Wardens had found out about. However, I've since been corrected on this and want to thank the posters who did so.
+ I also like how even during a Blight the Wardens have to beg, borrow, and steal their allies. One has to prostitute himself (a male, which again is something you don't see very often in these sorts of books) while later gathering an army of Apostates, Casteless, and Freed Slaves. That was a nice touch as was that Orlais and Tevinter don't give the Wardens a damn thing. Think on that, also. The Orlesians, who invaded the Dales because they didn't help, DIDN'T HELP DURING THE FOURTH BLIGHT.
What a bunch of ****s.
+ A lot of people have been complaining Blood Magic was depicted as much more dangerous here but I'm not sure it was. We saw that Uldred and company were all turned into abominations by their use of it during Broken Circle. It wasn't a bunch of "willing" transformations either. Likewise, you can blame the whole incident with Connor not on his being a mage but having access to a Blood Magician's books. Then there's Avernus and his "rip in reality." In short, Blood Magic has ALWAYS been the ticking time bomb power.
The idea it's just some harmless science is the big problem.
+ Blood Magic being a sucker trap is much easier to believe, though, when you note that most Blood Mages don't UNDERSTAND Blood Magic as it was acquired via Matrix download or from books written by people who acquired it via Matrix download.