Now I know it's been a few years since I've actually read the 7th book and granted I kind of didn't really pay attention to anything really other than the major plot points, but I would say this movie hit them, to solid expectations. Unlike the past movies it stayed to the book very well, and even though I knew what was going to be happening next I still was shocked at some points. And I must say, I liked the fact that they gave more characters in this movie more "comic relief" segments, it used to just be down to a few select characters like Neville, Seamus, Ron, etc. to do the "comic relief" parts but it seemed everyone had they're own funny points in this movie and I really liked that. Definitely recommend to see it, I most likely will be either seeing it again or definitely buying it when it comes on DVD.
Seeing as I read the book it wasn't great, but it wasn't bad, but I'm sure anyone that hasn't read the book would surely like to see this movie. I mean no movie will ever be exactly the same as a book, and I can actually tell only a few details different, and it didn't seem to ruin it.