As a movie, this was pretty good. I like 5 better than this one - only after watching it a second time.
However, this was my first time watching the movie after reading the actual book, and it was somewhat of a letdown. Too much of the plot that I read just a month ago (2nd time) was fresh in my mind but not on the screen. SPOILER ALERT BELOW
Generally speaking, they stuck with too much of the beginning of the book and cut out far too much of the end. I wanted the battle and funeral! I felt so cheated when I got neither. Plus, there was really just an allusion to Harry's relationship with Ginny. Disappointing for me. 
The best thing to come out of this movie for me was recognizing that I obviously need to read books 1 - 5 because I must be missing some important stuff.
Specifically,