I finished Harry Potter and the Half-Blood Prince last night, and my daughter finished it up this morning. I'm afraid I have to agree with Shannon... I want Rowling to go back to writing books that don't make me feel like flinging myself out the nearest window when I finish. I can take a certain amount of darkness, but this book was utterly and totally depressing.
My daughter's comment? (Bear in mind this is a child who has been obsessed with all things HP for years.) "I didn't like it much."