I didnt like the book, but accepting it was a film based on a book I didnt like it was ok.
That said it was a little too long, and considering it is hardly the longest book, splitting it into two movies when all the others were done in one was completely unnecessary.
The best part of the film was the middle when Harry and Hermione were on their own. Lots of romantic scenes there, which I loved.
I thought the guy who played the new wizard prime minister did a good job.
Visually a lot of what they did I liked, the ministry scenes, the outdoor scenese, Lovegoods house, the 3 brothers, all good.
Emma Watson, in shiny silvery style is very hot.
One thing I thought the movie made clear is that Ron can be a very petty man. I know the whole locket scene where he watches Harry and Hermione is supposed to be the evil in the locket fueling his worse nightmares, but everything in it is stuff he has said and thought throught the series, simply amped up a bit, and it just, when actually viewed, watching him see them say the stuff that drove him to be angry earlier, it's all so minor and inconsequential, comes across as petty.
And the best scene in the film? harry and Hermione dancing to some very great music.