Man, you're blowing my mind. Everything you said is exactly why I love the book so much, exactly why I love turning every single page and relishing every single line as I read, because it really is quite simply one of the most brilliant and well-crafted pieces of literature out there. I don't even know where to begin when praising it - the characterisation of Harry, the influence of Umbridge on Hogwarts, the DA meetings, Grawp, the fight in the DoM and Sirius's death, the fact that the sheer quantity of great moments is a favourable point in itself... It is, for lack of a better word, epic.