Is it possible to get these ratings? (Civil, Economic, Political?)
And does having that rating mean you are a specific UN Category, or not?
It is possible -- in fact, one of my friend's nations, Aelenti, was able to get past even those ratings and get Frightening, Frightening, Corrupt.
As for what UN category you will be, since Civil Rights and Political Freedoms are tied to UN category, you will be either an Anarchy, a Civil Rights Lovefest, or a Left-Wing Utopia. It is possible to get a Powerhouse economy even with a socialist system. It's just much harder.
The result depends on your economic freedoms, which are tied to your economy but not the same as it. Most things that increase economic freedom will increase your economy, and vice versa. But at least one issue -- the gold mine one -- does the opposite.
Hope you find what you're looking for.
The Russian Empire
Look at my economy, its Frightening, and i have a socialist/communist ecomony. Its good stuff.
The Most Glorious Hack
Actually... I was once Excessive / All Consuming / Widely Abused and was a Corporate Bordello...