I enjoyed part 1 quite a bit, I saw it last night at the midnight screening.
Found it much better than the last 3 films. Movie 5 was awful, save for the voldemort/dumbledore fight, and movie 6 went on a tangent and made up random shit, with awful screenplay lines. I found this one had the heavy task of trying to piece together all 6 movies, which isn't easy. I felt it had the proper tone, lots of fear, and frustration, and I felt that they stopped at a good spot in the book. You go too far into the horcruxes, the public will hate to wait so long for part 2.
I read the book twice when it first came out, but I can't remember a lot from the books. So during the movie my brother and I would ask each other questions, to try and re-establish our knowledge. Now he says he has to reread the book. I sure as hell won't. She wrote it poorly.
But yeah, good movie.