Mostly it worked for me, and once the first death occurred I knew we were in for a VERY interesting ride. As others have said the wand lore thing did seem to be forced into the story a little - if there had been more about it in earlier books I'd be a lot happier. Admittedly that wand was supposed to be exceptional, but it all got a bit silly with the "I've disarmed him and he disarmed Dumbledore" stuff. It would have helped if they'd kept it just a little simpler.
The bit that really annoyed me was the wholly unnecessary epilogue, which was pure pandering to the shippers.
OTOH there's a rather interesting little idea for a Buffy crossover in there, and the character I play in a post-Voldemort RPG (Horace Slughorn) just got a lot more heroic...
