Give us some magical yardstick to measure with, then. What would make a perfect State perfect? GDP? Prison Population? Health? Religion? Technology? Nuclear bombs?
A legitimate question, & a damned hard 1 to answer! Do note that I revised "the perfect State" to the "ideal State", which is a subtle, but substantial nonethless, difference. What would make for the Ideal State? I was the one who voted for Plato's Republic. I believe that the ruling class should be well trained in Philosophy, Logic, and Law. This background allows them to rule with a firm, wise hand. It has been some time since I read The Republic, but I recall that there were three classes in society, the Rulers, the Guardians, and the Artisans. Obviously, in modern terms, there would be a more complex society than this. But fundamentally, society would be ruled by Philosopher Kings in the line of Platonic Thought.
Of course, this assumes that the society is multi-confessional and multi-racial. In a society dominated by Jews or Muslims or Christians or Hindus, I'm fine with Jewish or Muslim or Christian or Hindu law prevailing, although I still think you can have Philosopher Kings, just geared toward Jewish or Muslim or Christian or Hindu Law. In a case where this occurs, every 50 years it should be determined whether it is socially advisable to continue to rule the State according to religious laws.