Thank god, JKR didn't kill off Mr. Weasley in OotP. The last thing that bloody mopey book needed was a mourning Mrs. Weasley.
The off-screen death of Tonks & Lupin seemed right to me. Since everything is from Harry's perspective, it would make the battle seem too contained if he were to witness every major death. The sudden shock of their demise hits us like it hits Harry.
I've been saying since book 2 that I expected that when the shit finally came down that either Harry would save Snape or vis versa leaving one or both of them very conflicted. So, Snape's actual death was a major shock. And I loved it. Nothing else in the book stated quite so clearly that siding with merciless evil was such a treacherous undertaking. Also, I think that since so much of Voldemort's killing in the book was done in anger, the cold, almost genteel demeanor of Voldemort as he had Snape killed made the scene all the more horrific.
I think the Kings Cross 'afterlife' was well handled. Yeah, heavy exposition but brisk. I don't think that Harry's Horcrux was the scar. I think its absence in the 'afterlife' is because this was an idealized Harry, as evidenced by the fact that he didn't need his glasses either.
Harry taunting Voldemort by calling him Tom - priceless.
I don't think Neville killed the penultimate Horcrux. I think he killed the last one. I think Voldemort actually killed the one in Harry when he first zapped him in the forest and that's what caused Voldemort to crumple. With that gone, that's why the second Aveda Kedavra finished him off; there was nothing else left of Voldemort in Harry. Yeah, you read that right, Neville is EVEN MORE THE MAN!
That Voldemort, he just doesn't learn does he? Maybe a quick Stupefy might not have rebounded and then he could just have an animated sword run Harry through. Stoopid Dark Lord, no Dark Donut.
I was surprised that Draco didn't get to do something at least semi-heroic at the end. I felt his rebellion against Voldemort had been brewing all book long. I guess he just couldn't grow that spine in time.
I find it amusing that the Wand Allegiance plot point was the biggest Handwaveium in the book. Crazy literal, neh?
Oh, and one last thing that I haven't seen anyone discuss; I was really impressed with the cover to the U.S. Edition of the book. While the bright warm colors were a shock, they were also a nice change after the last couple of dark gloomy covers. But, what I'm really admiring here is what scene they chose to focus on and how it was represented. As I read the book, I kept having new theories; at first I thought his arm was outstretched to receive the ghost of Hedwig (and that the background figures were the ghosts of the dead), then I thought it might be him releasing Dumbledore's Snitch to activate whatever was inside it. Finally, I realized that he was catching the Elder Wand, and that made me realize that the shot of Voldemort on the back wasn't him trying to reach Potter before he completed some action, but that Voldemort was actually falling backwards dead. Really, brilliant misdirection in that cover.