Here are my thoughts, in completely random order:
I really need a "ROCKS FALL! EVERYONE DIES!" icon. Fucking hell. Anybody have a body count for this book? Hedwig, Remus, Tonks, Fred...
ARIANA. I nearly pulled something laughing so hard. ARIANA DUMBLEDORE. Has JKR been reading pottersues?
OMGWTFDUMBLEDORE. Honestly, how awesome was that? Not the whole hallucination thing at the end there, but Dumbledore backstory! With Dumbles as a real human being! I loved it. I never expected Dumbledore to have been friends with Grindelwald.
And how awesome is it that all the fan speculation is true? RAB is Regulus Black. Snape really was Dumbledore's man, and really did love Lily. (HA! Take that, Snape-haters! *dances*) Harry is a Horcrux!! (I actually shouted "I KNEW IT!" when that was finally revealed.)
Neville? Fucking awesome. Dumbledore's Army FTW!
I swear to God, I thought I was reading fanfic at a few points. When she was describing the Ravenclaw common room, I actually thought, "That sounds really nice. I wonder how it'll look in canon?" *facepalm*
The part I liked the least: that damn epilogue. She could've ended the book perfectly where it was. Did we really need to see One Big Happy Weasley Family? Come on. Who stays with their high school sweetheart? And OMG. Lily, James, and Albus Severus? *headdesk* I'm with pstibbons--remaining canon only through OotP works for me.
So, do you have any complaints?
Okay, so this has nothing to do with DH, but we're watching PBS Sprout, and right now there's some show on that I don't know the name of, but one of the characters just said, "I can't go on holiday without my bucket." And all I could think was, "Excuse me, sir, I believe you have mah bukkit."