First off, the midnight premiers of the Harry Potter movies are always the best.
The movie was pretty funny and it delves into the characters' personal relationships more, but the parts with The Burrow and the added scenes with Ginnny and Harry threw me off. If they burn down The Burrow, where will they have the wedding? Granted, they could fix it, but it just leaves a lot more questions than if they had just left it out and PUT IN THE HOGWARTS BATTLE SCENE. That was all I wanted, to see everyone battle (and I knew the Inferi would be cool), but sadly I was disappointed.
So basically, very funny, very well scripted, but not really for hardcore nitpicky Harry Potter fans.