Ok, i want to give some feedback too. I played one game so far. I startet as Spain and switched to Austria later. The game played nice with lots of AI vs AI warfaring and cities beeing captured and recaptured.
Cordoba collapsed a few turns after i spawned because barbs razed their capitol

. It took some time to settle the whole Iberia. I placed many cities and it played out nice that they didn't expand to the big fat cross so quickly. I think the resources in iberia are well balanced and placed, allowing many overlapping cities, but no super cities. I like that.
Burgundy conquered independent Toulouse, but didn't settle in the low countries, probably because France controled the territory there. Nevertheless it was as strong as France and constantly battled with them. Burgundy conquered some french cities and lost it again. I think England was at war with France too but didn't move their troops out of their town in Normandy. Eventually Burgundy and France collapsed both. After they respawned Burgundy vassalized to Genua and France to England.
Venice started weak. They didn't get Ragusa, because Bulgaria got it first. But they conquered Constantinopolis collapsing Byzantium. After Bulgaria collapsed too they conquered the whole dalmatien coast up to Greece and settled on the Krim. At the end they were second in score after spain.
The start as Austria was devastating. Germany declared war on me and moved their troops in front of Prague the same turn the city flipped to me together with Salzburg.
I had no chance to defend the city without walls and just two arbalests. I couldn't upgrade my units because iron was out of reach until Wien expanded, which took a while. The heavy lancers austria starts with are useless against promoted knights and teutonic knights. Better units and some walls would have helped. I loaded several times and then decided to cheat with the wb to play along.
Germany then attacked Poland and conquered Stettin, but Poland defended well and retook it. The city changed hands a few times. With Moscow and Lithuania it was the same, constant warfare without one party becoming stronger than the other.
Norse warmongered with england, germany, poland and later sweden.
Ottomans were weak. Didn't attack venetian Constantinople and eventually collapsed.
Portugal was weak too. Didn't settle the islands for very long.
Cordoba respawned with just one city and collapsed early again. Could need a buff here.
Overall the AI placed cities very badly, ignoring hotspots on the settler map very often.
The plague hit me as austria very hard. I don't like the mechanic as it is now at all.
Reformation and swedish spawn worked for me.