I am straddeling the fence on book 7 at the moment...
It is certainly, from a literary standpoint, one of the stronger books (minus the craplouge). That said, the first half of the book was slower than the first half of the Harry Potter books usually are- and that is pretty damn slow. In the past, while all of the real action was reserved for the last few chapters, in the beginning we at least had qudditch, Hogwarts things, etc. But not so much with this one (save for the silver doe, the cafe, and Godric's Hollow)- might as well been called Harry Potter and the Extended Camping Trip.
The seventh book and fifth movie were both suprisingly dark, dare I say downright eerie.