Harry Potter and the Half-Blood Prince

I enjoyed Harry Potter and the Half-Blood Prince more than the previous couple of Rowling books, mostly because I liked (and respected) Harry more in this one. Even Ron and Dumbledore seemed less annoying to me, so the book was more of a pleasure to read.

I'll put my comments under a spoiler-cut just in case there is anyone in the world who hasn't read it yet.
( Comments on the Half-Blood Prince )