Good day for all!
I'm newbie in this thread, forum & site, than excuse me if I'll repeat something that have already said about this topic.
Well, I want to say that I'm not the fan of Communist government in this game & in reality. I know what I'm saying because I was born in Moscow, live in Moscow & want to stay here until my end.
I think that no one in sane mind prefer Communist government to Democracy if he has valid choice. Problem is - very often you haven't this choice - in your game, or in your reality.
I don't like any political talk then I want to stay in the Game terms. I'm very old fan of the Game & now I can't have any trills from it if my game level is below Deity. Last years I prefer to play only "real terrain" games - resemling actual forms of our Earth. I must to say that I'm almost always go for Communist government if I'm playing "as Russian".
Let's imagine this Standart Russian game on "Deity" level. Let's use world.mp map from CivMGE package with fixed start points for Nations. (Resource & hut distributions can be random.)
Define your computer opponents:
White - Russian (you)
Green - Babylonians
(it's important - they simulate Turks, Perses, Turkestan and any other south Russian neighbourghs of "reality")
Blue - German or French
(German - preferrably, because they are less aggressive in ancient times, but becomes main threat in modern)
Yellow - Egypt
(it's important because you need some "plug" in Sinai for any "big" powers can't to "siphon" their early pressure in Africa)
Azure - China
(it's most important Nation because Huan-he - Yang-tse basin is "natural" fortress & any nomads will be repelled from East Asia to West by this Nation)
Orange - England
(it's important because England is island & Englishmen of this Game will become most formidable sea-threat in no time. By the way - first of all Englishmen of this game will "find America" and main part of England nation will be placed in American continent

(Surprised?)
Purple - Mongol
(main pesk or Russian civilization - "Russia" of the Game hasn't any natural borders before waves of "Mongol" onslaught, and "Mongol" must to press on West, because "China" press them from East & Mongols haven't any "natural" walls before Chine slow advance into steppes).
Let's the Game begin!
Your strategy or "style" can be anyone, and it's advisable to go up technology tree as high as possible, because very soon you will be attacked from 3 sides: by German from West, Babylonian - South & Mongol from East. I always can make peace with German after some "little bloodshed" & secure some borders there. Usually I can found some compromise with Babylonians - they "canalize" their agression into empty Indostan (story of Great Mughals of "reality") & after that will meet with Chinese in South-East Asia. But Mongols... It's real menace for my poor Russians! All resources of my country will be poured in military in no time. My settlers wil create roads & irrigation & all will be pillaged mercilessly by bloody "Mongol" nomads! (In some parts of my brain I can understand that unlucky "Mongols" is pressed from their lands by very strong "Chinese", but I can't see "Chinese" & "Mongol" drive to West is - just their own evil intentions. If you want to feel real Hate, playing the Game - try this disposition - it's real hard feelings, when "heathen" destroy your roads, pillage your lands & burn your cities...
When you wipe out bloody Mongols completely (you will do it of course, because if you play Game by your heart - so much burns & pillagings deserve only complete extermination this bloody bastards) you will find that your science is very backward (compared to Germany & England, because these Nations hadn't big military expences), your lands is poor (Mongols sacked most beautiful & productive lands on your south), your military is outdated. What can you do?
Simple scientific development will make you complete outsider - your roads is crashed and trade output is scarse, then you must begin some military conquest for new technology. Your military is outdated in comparison with your neighbours then you must make war in "cannonmeat waves" fashion. Your East neighbour - China is very far for your producing centers & West neighbour - Germany is superior in military technology. Then you have only one option - South, or Babylonians. By the way some of this "Muslims" had courage to create their cities in your former territories that was ravaged by Mongols. It's good cause for war, but better cause is - remain parts of your ancient roadnet let you transport your weak but numerous armies with speed of lightning (OK - very slow lightning

. Numerous "Russian-Turkish wars" of "reality" just begins!
OK, you smashed unlucky Babylonians - what's next? Very important thing is - you didn't wipe Babs as Mongols, because this war - isn't for your hard feelings, but for technology improvements & lebensraum. You can develop your civilization & improve terrain now. When you will have any chance you must go to more advanced Government then Monarchy.
Will it be Democracy or Republic? Definitely - No, because your country is great & dangers from neighbours is real (Babs want some revanche all time around!). You must have relative big military for take Babs in bay. Strange paradox, - you begin to produce really expensive war toys, because your technology allow it & yor fear your German neighbor, but all your wars is against Babs, or Chinese which have inferior armies in comparison with you, but like to attack your little & poor defensed cities on far south & east borders. You must pour great part of your "shields" for your great & expensive army that in most part takes its time by wiggling its thumbs. (It's very unadvisable to try German strength, because your armies is superior to Chinese, or Babs, but bloody inferior to English, or German

. Republic & Democracy "spend" your "shields" on military maintenance, but you can't allow it! By the way - your roadnet is inferior yet, then gifts of Democracy - isn't so good as you wish in your case.
Can you be Fundy? No - strictly. Your military has already been inferior to western counterparts & Germany begin "lebensraum thirsty" - it's question of your survival in this time! You must to have good science output, or - simply die!
Then you convert to Communist government. No any good feeling for Communism - it's just a business. It's just question of Life & Death - no more, no less.
Then if you survive great German onslaught, & can rise your western (most productive & developed due to long Peace on West border) cities, you can convert to Democracy. If you can - you must to know - you've just won most bloody & cruel variant of the Game. Don't mind your Score or Percentage - they wil be low. I promise you
If you want to try Communist government with a reason - it's most sure way to do it. Enjoy! If you can...
P.S. Don't save & reload - it's not sportsmanlike manner

Main reason to avoid repetitive reloading - Mongol cavalry isn't great threat under heavy reloading & you very soon will be Democrat without any problem! Alas, we can't make any "reloads" in "reality" - then be more sportsman in the Game!