.. Marxist, Green and..Federalism! (the other civilizations only use Despotism; Monarchy and Fascist! for Gov. and Liberal for Society, and Slavery. Only few Civs use Free Market)
I think there's a way to "fix" this situation, i mean for example, to use Slavery it will do a +6

in every city plus a +3 with other civilizations that use Liberal or Marxist.
And for Marxist, IMHO it is useless a +1 free specialist per city and +35% culture per city. It would be better with a +20% culture per city, + 20% gold in 5 biggest city and a -10 % science in every city.
and Parliament too, i always use Bureaucracy for Power i think Parliament would be better with a + 6 happy in every city, + 50% great people in every city, + 10 % gold in the 4 biggest city and +100% war sadnees in every city
Can i suggest other things?
Why only Democracy has got a special building? (agora)
Why don't make special building for Despotism, Fascist, Parliament, Green, Communism, Socialized and expecially Federalism?
For example a usefull Federalism bulding could be a +1 of a special type of forbidden palace (we can call it.. mmm.. Federal State Bulding??) per 5 city!
I mean, if i have 30 city i can build 6 Federal State Bulding and so on..
Or for example a special type of Fascist bulding could be a Eagle Theatre (+ 25% military and -30% culture and - 30% science in the city where it is builded)
^^''