Let's cover the negatives first: the mediocre writing descends to abysmal in too much of the dialog, redundancies imply the lack of capable editing, and the plot -- well, this is about vampires and other supernatural beings.
On a positive note, it is the best written of Hamilton's books thus far.
And there you have my confession: I've actually read this tripe. Sigh. Hey, everyone's entitled to a vice or two.