Eastern Europe has for the most part been a smashing success, I would say. Possibly one could include India and the US as well although it is often difficult to difference between a popular revolt and an elitist one.

In any case it is important to keep basic logic in mind. Lots of things have to work out in the right way to have a sutainable democracy. If you have ten different popular revolutions in ten different countries with ten different regimes it is rather unlikely to have the same outcome in the short and long run....