I would say the Vasudans are fairly autocratic. But I will say that the Terrans might be just as autocratic.
I'm going to reference Firesteel's excellent analysis of Freespace 1, which on this same forum section.
So I'm going to say that Freespace 1 had me roleplaying as a soldier serving an autocratic state. Why? Well, you are never given any reasons why you are at war with the Vasudans. There's some brief mentions of diplomatic incidents and so on, but none of it justifies starting a war, at least for contemporary western democracies. Can you imagine today's France declaring war on Germany because the German ambassador was impolite and didn't know proper etiquette? That sort of casus belli would be something you expect from feuding monarch states in the medieval age.
In Freespace 1, I fought for the GTA because I was a fighter pilot. I didn't question why I was killing Vasudans in bulk. I didn't think it was strange that we were going to invade their homeworld, possibly drop a few nukes on it, all so that we can subjugate their species. And I served GTA proudly too. So I think the Terrans are militaristic and probably fairly autocratic as well, as these two traits often go hand in hand.
Taking some more liberties from Blue Planet, we see that the Terrans are highly militaristic compared to the Earthers, and they do not shy away from hiding information from its own public. We know the GTA was overthrown and replaced with a very progressive society. We know Earth was a sort of economic paradise, compared to the Lost Generations of the Terran worlds. We know from political science research that in real life, poor economic prospects often lead to turmoil and the empowering of strong figureheads and a powerful state.
The Terrans are autocratic. The Vasudans are autocratic. The Neo-Terran Front was probably just as autocratic as the Terrans but sprinkled with racism and hate.
When the threat of extinction lurks around the corner, it is easy to agree to giving up your liberties and building a strong military.