Well, I just saw it today, and I
LOVED IT.
Perhaps because I've trained myself to not read the book again so close to the film coming out, though I've been listening a little bit on audio.
In any case, I got thoroughly involved, and surprised myself by becoming much more sympathetic for Draco,
and even quite emotional over Dumbledore's death.
I am curious to see what they will explain in the next installment (like Dumbledore's hand?), and... I totally forgot that SNAPE is the Half-Blood Prince (can someone remind me why? He wasn't a half-blood... was he?)
I tried to train myself after hearing all the criticisms of Lord of the Rings, not to read the books beforehand, or if I do, read them well in advance of the film's release and have no expectations.
So while some questions came up in my mind, I did really love it.
Personally I would have loved to have seen more of the Weasley's Joke Shop! But I know that's not in the book either. I love those two.
P.S. - it took me a few minutes to adjust to seeing how grown up they all are! Particularly Malfoy and Ron!