Christopher Hitchens pissed off a lot of people in his time. In my opinion - totally worth it.
Hitchens is a full force of no apologies against religious tyranny. He brings forth all its shames, its misdemeanors and the misconceptions surrounding religion in all forms - no religion escapes his critical eye and words. He knows what he's talking about, he has done his research and he's experienced it first hand. This is what makes him an authority on the subject as opposed to a blabbering troublemaker who doesn't know what they're talking about. He is witty and insightful and shamelessly pulls apart religion, piece by piece, to show how humanity is better off without the illusion of god in any of his names or forms.
Being an atheist myself, God Is Not Great did not surprise or shock me, only re-affirmed my own thoughts and ideas and gave them support. I applaud Hitchens for his effort as it cannot have been easy to write something like this, but I'm glad he did.