The ideal government should reflect the people's wishes. For example, I don't think democracy suits Russia, I think a strong leader who cares about the country is more important than representation. Yes, Lenin and Stalin commited attrocities, but Russia is remembered because of them. Today, the country is still unofficially a communist country because of their legacy. No, Lenin and Stalin weren't the best leaders, but they set an example to be improved upon.
Some countries could benefit from monarchies, others could benefit from democracy, others from communism, etc. I think Germany is a country that might benefit from communism, since the Germans are very hard-working people and care about their country's needs above their own, in general, although there are many flaws with communism that could undermine long/short term goals.
Monarchies and dictatorships aren't inherently bad. They're bad if the leaders are selfish. They do, however, remove a lot of the red tape that prevents many policies from working. Democracy and communism allow the people to come together to contribute as a whole. Democracy doesn't work nowadays though, because every citizen has to contribute and be aware of the problems in his/her country, which they're not; they just vote for the most popular canditate and wait for the next election in a few years time. They don't campaign against wrongdoings unless they become popular and thus are highly sensitive to manipulation. If the only people who contribute are the ones with a certain degree of power, then how is that democracy?
Anyway, I'm not the biggest expert on the subject, but I do think, based on everything I've watched and read, that every country has a different mentality.
Churchill I believe said that democracy is the best of the bad systems and he has a point, but I expand on that and say that every system can be potentially bad and should be tailored to each country's needs and overall mentality.
Russia and China are huge, so could they really function as democracies without splitting themselves up into various countries/states?
Again, not an expert, so take what is said with a grain of salt.