Every government system is terrible in some way. Hell, it goes against the nature of humanity in the first place. They're working towards a common good but who's to say what's right and best for each individual. You can't possibly be serious and tell me we can reach a common ground.
You put a free system where you give the civilians liberty, you're gonna have trouble within the community, since people have VERY different ideas on how liberty is to be achieved and maintain.
On the other end of the spectrum, you've got vehemently and violently enforcing YOUR idea for a perfect system, and anyone who disagrees- well, you get the drill.
My point is that there's no objective worst government system. There's only personal perspectives on the compromises those systems propose. Personally speaking, fascism's on the lowest of the low. Even discounting the moral dilemma of it, fascism is bound to topple one way or another. If you disagree with it, into the body pile you go. Even if you agree with it, there's no telling what the government will make you do to keep their ideal community going. Failure to upkeep your assigned post is as good as mutiny. And, when your government system leans more on "dispose those we don't like", those "people we don't like" are bound to strike back.
If you want to be absolute, you need an immaculate system with no compromises AT ALL. And as proven countless times, humans are not to be trusted with maintaining 100% productivity.
The system we have now? It's not good. It's fucking terrible, in fact. But it's the best we have to offer at the moment. In fact, there's no way of changing it at this point. Roots of power intertwine so deep that the system will stubbornly keep itself up even if it's running on fumes, because one falling cog can kill the whole thing. It'll doom us all back to monke; which isn't a bad thing, per se.