There are some SPOILERS from here on out. So, stop now if you don't want to know!
First of all, I am still not convinced that Snape was a good guy. Before it came out my in-laws and I pow-wowed (we were at a family reunion when it came out) and made a bunch of predictions. I said that I thought Snape was mostly out for himself. He wasn't good or bad per say, he was simply doing what was best for Snape. Even after the dramatic chapter near the end (which is one of my favorite chapters in the series), I still am not convinced that Snape helped Harry and the Order out of the goodness of his heart. I think he did it to relieve his guilt and in an effort to prove his love. Harry forgave him and blah blah blah, but it all still seemed really self-serving to me.
I thought that Hedwig's death was the saddest of all. I more or less guessed everyone else who would die (not Dobby because I didn't even think of him, but it made sense), but Hedwig was a complete surprise. I know Hedwig was "just" an owl, but she really did represent the wizarding world, and the beginning of Harry's new life, and lots of good. I didn't see it coming at all and it broke my heart. I also thought Tonks, Lupin and Fred's deaths were unnecessary. I figured if Tonks or Lupin died the other would too, but it seemed cruel to leave a baby behind.
I was afraid that Arthur Weasely was the spy in the Order. Right after the death eaters surprise the Order by appearing at the relocation, the members begin questioning each other to make sure they aren't impostors. Arthur wouldn't let Kingsley ask him because he wanted to check on George (understandably), but no one ever did check on him later (at least that we saw). I was SO relieved when he wasn't the impostor.
Did Kreacher's transformation bother anyone else? I can see him being nicer and happier after getting his secret off his chest and Harry being nicer to him. But to go from barely functioning to a shiny house and cooking large meals every day seemed a bit extreme. However, I was glad that he was redeemed. I always kind of felt bad for him - he seemed to have a particularly hard life.
4 out of 5 stars (but a necessary read for fans of the series!)