Swarm Of Beasts here.
The most interesting thing about this novel, to me, is that it has a number of things that ordinarily would push all my buttons and make me go squee. Like sexy devils! And sexy angels! And sexy Kit Marlowe! And cute gothy people! And then-- it turns around and stays too honest and dark and brutal to actually make me go squee. It's not even the turned-up melodrama of everybody dying beautiful tragic deaths; it's something quieter than that, and harsher in its own way.
Russ Allbery here:
Bear doesn't have quite the touch with multicornered politics between Heaven, Hell, and other powers that Neil Gaiman has, but I found her take quite satisfying. The twist she brings to Hell that I haven't seen done before is to take several major literary conceptions of the Devil (Milton's, Marlowe's, etc.) and populate Hell with them, as rivals and occasional allies. It's more satisfying than the normal picture of one Satan and his subservient devils and it's a springboard into exploring differing conceptions of evil, rebellion, pride, and outlooks on what Hell and temptation should be. The powers are handled with suitable impressiveness and distinction: tragically impressive physical force, beauty and pride, and devious manipulativeness are all present and have their time in the sun.
Click the links for full reviews. Not very spoilery in either case!
Also, a review at Romantic Times by Natalie A. Luhrs, here, which is brief so I will not quote from it.