I've read the letters, Hitchens books on Orwell, listened to his lectures on Orwell, read Orwell's essays, and his books. The message is to me, that resistance is hopelessly futile once totalitarianism is firmly entrenched and the state has absolute power over humanity itself. That's why Winston is broken and loves Big Brother at the end of the book, because there was no other possible outcome.
It's a warning that if you don't stop it by recognizing it's rise through dictatorship over language, over emotions, and finally over thought it will be impossible to resist. Well, that is what I (and apparently Hitchens) see in his writing. I also see plenty of parody, especially towards Emmanual Goldstein and his book (Trotsky), purges blaming foreign conspiracy, and the illogical party slogans.