Well for Part 2, I'm deeply disappointed with the King's Cross:
They don't talk about Dumbledore and Grindewald and why Dumbledore is so proud of Harry for being the better man.
They don't talk about the deathly hallows at all, which is the title of the movie, and why Harry is the true master of death.
They don't discuss Ariana and why Dumbledore's father killed three muggles (p1) and why "it was all his fault" (hp6).
Harry doesn't even ask if he's dead? "You're dead, so I'm dead?" It's such an obvious thing! So many people were wondering if he died (those who didn't read the books).

And I'm a little sad they didn't make Dumbledore's prearranged death with Snape more dramatic than what it was. It was a huge thing!

I didn't feel the deaths were portrayed as dramatically and emotionally as they should have been. In the book the entire end of a chapter described how terrible Fred's death was, but here? They didn't even show his face.

Also, I'd have liked the walk to death to be sadder, perhaps with flashbacks with memories from all of his years at Hogwarts.

AND WHEN DID TONKS HAVE THE BABY? She never even announced she was pregnant..

Lastly, since when did all of this "start" with them jumping off a building and morphing into one awkward being?

Other than that, the movie was brilliant!! King's Cross is my major disappointment :/