IIRC, Jemisin's quote was something about how well Kate Griffin did urban magic. I found that to be spot-on with this book. Definitely the way she renders the magic is the most lively and enjoyable part. There are some parts of the book where she goes on and on with descriptions about non-magical London that I found dull. Also, the protagonist is this weird hybrid of person/other being that made it kind of hard to relate. Especially since gradually revealing the nature of the hybrid and the other being was kind of what she used to propel the book forward. I like character-driven stories, so it was a little annoying to not really know the dang protagonist until the end. She did pull off a nice satisfying ending and did a good job of character development/reveal at the end, so that was good. I would have felt quite cheated if she hadn't.
I'll probably read the next book in the series, unless I don't get around to ordering it or maybe decide to stop wasting so much time enjoying myself and instead do all the responsible family stuff (scrubbing down the house to prep for a home birth, playing with older munchkin/taking her places, buying little baby suits, setting up the baby environment, prepping to move in August). In general, I recommend this book in a mind-candy-plus-vitamins kind of way.