We'd seen several reviews -- notably Margaret and David, who both gave it low scores but admitted they didn't really 'get' it because they haven't read the books.
I'm still stumbling over that thought.
But anyway -- in our view -- brilliant.
We felt it definitely captured the mood of the book, dark and despairing. Oddly, we both hate Bellatrix LeStrange more than Voldemort (Helena Bonham-Carter is so so good!) and the only disappointment is that we have to wait a while to see the second half of the book.
Overall, we gave it 5 rubber duckies out of 5.