Well, there's that, then. I was impressed right off the bat with audacity of the flap blurb -- in lieu of any plot summary or such it simply read "We now present the seventh and final installment in the epic tale of Harry Potter." In other words, "look, if you don't know who Harry Potter is at this point, we don't need your business -- just go crawl back into whatever cave you're living in."
I found it somewhat darker and heavier* than the first six, but it's been a build to that I suppose. Now I'm off to read all the sites I was avoiding for the sake of spoilers.
* Including, of course, literally.