I will start by saying that I read HBP a few years ago so I wasn't trying to compare it to the book. I think it is crazy for people that expect the movie to mirror to book. With a book of that size the movie would be over 4 hours long!
My daughter and wife said the ending was sad and didn't give you a sense of accomplishment of Harry's mission but that's the way the book ended. The Deathly Hollows will tie all the loose ends up for fans of the series.
It was nice to see Ron finaly see that he is the apple of someones' eye.