A very good point. It was a powerful weapon in the Cold War.
It's also worth pointing out that 1984 is about not just the way the state works but the mentality of the people who run it. 1984 makes clear that a dictatorship is inherently corrupt and sadistic: O’Brien himself says that the purpose of a dictatorship is to satisfy its rulers’ lust for power, and the way that one wields power is to cause suffering. This contrasts with Huxley’s world controller in Brave New World, who says, IIRC, that the world has to be run for people because they can’t be trusted to run it themselves. Essentially, the point Orwell is making here is that all dictatorships are, ultimately, morally intolerable. Orwell attacked left-wing academics for their loyalty to Stalin and other dictators, and this point seems to be related: under the superficial glamour, order and manliness that a dictator will try to present, there is only really sadism and cruelty.