Hmmm...I can't say I didn't enjoy reading it, because I did. And yet...it wasn't really exciting. I'd gotten most of the way through the book before I realised that I was still waiting for the exciting bits to start. Then there was an exciting bit - fighting the Death Eaters in Hogwarts Castle - and then it was all over.
I found it more interesting than gripping - quite a lot about Voldemort was explained but not a lot happens otherwise and the Big Bad himself doesn't actually show up at all.
Probably the most disappointing thing about this book is that it felt more like a deliberate Part One of a two-part series, rather than a stand-alone story of its own. Of course, having said all that, I will probably read the final installment even if it's only to find out how it all ends.