Order of the Phoenix destroys all the other books. I doubt even the last one will be as good as Order of the Phoenix.
Spoiler:
Harry Potter and the Philosopher's Stone
Harry Potter and the Chamber of Secrets
Harry Potter and the Prisoner of Azkaban
Harry Potter and the Goblet of Fire
Harry Potter and the Order of the Phoenix
Harry Potter and the Half-Blood Prince
Harry Potter and the Deathly Hallows
Order of the Phoenix destroys all the other books. I doubt even the last one will be as good as Order of the Phoenix.
Spoiler:
There's one hole in every revolution, large or small. And it's one word long.. people. No matter how big the idea they all stand under, people are small and weak and cheap and frightened. It's people that kill every revolution.