I've just won my very first RFCEurope game.

Some final observations:
- Rome should't become someone's vassal.
- Venice likes to give techs to their vassals (usually Genoa and Rome), who also become very advanced.
- Cordoba and Spain seem to be in balance. Neither of them rules Iberia, so they stay fairly small. The result is that Spain has a low tech rate (they are two levels* behind)
- Overall tech rates are too high. In 1500 AD, the advanced civs like Moscow, England, Poland, Germany can research techs like SM, Liberalism and Biology, if they haven't already. Frankia and Cordoba are a level behind.
- I think the problem of the all solid civs is the foreign stability. Even with more enemies than friends (east Europe is orthodox, west Europe is catholic), my stability rating was +40.
- Moscow is, defended by it's master, a powerhouse. 18 cities, 459000 square km land, a solid tech rate, huge cities (over 50 million population). Probably the AI is going to win it's designed UHV goals, as barbarians weren't a real threat, although I haven't given them a single unit.
- Portugal is also rather weak. 2 close cities in Portugal, 1 colony. Vassalized to Spain very early, destimulating it's own development.
That's it I think. Now, should I start playing a really weak civ like Austria, or Venice, to see it's potential?