Just got home the other day and downloaded the new beta (12). You guys are doing an awesome job- so much improvement since the last time I played (beta 9)! Some of the UHVs still need some work, but still make for fun games (I love the German and French ones!)
Some things I have noticed-
-Cordoba is very weak (I beat them twice with starting units as Spain and Portugal, but they build their wonders.
-Byzantium is interesting- they lose east anatolia to arabs and seljuks, and collapse after Venice buys the Crusade, allowing Bulgaria to own all territory south of the danube. However, Venice collapses almost immediately after taking Constantinople.
As Ottomans I won in 1517, due to only having to fight indies, bulgaria, and Vienna (vassalized Hungary).
The scottish revolts work well- England can never hold on to their scottish cities. Also, if they can keep the norman city they flip, they have a tiny chance at getting the 1452 UHV, but that is rare due to the AI not being able to land SoDs.
Lithuania's unique unit is a god. I used a stack of ten of them to repel the mongols and then get the UHV. However, the AI never builds them, and gets steamrolled by keshiks.
Genoa's AI is excellent. The only thing with them is that city they build in corsica should be spelled Ajaccio, not Aiaccio.
Arabs are as good as dead once the crusades start. I recommend trying a mechanic where a "Jihad" occurs if they lose a city to crusaders and they receive units to take the city back.
Viking UHV is too easy. Maybe add the Shrine of Uppsala to the Vinland UHV. Also, if you really try, you can really rack up the viking points. In one game I got 86 (!)
All that said, there has been a tremendous amount of improvement. Civs actually go for at least some of their UHVs (specifically, Moscow always gets the barbarian one, Spain buys crusades and prosecutes to beat cordoba, and bulgaria gets their territorial one. Plague is a pain in the butt as it always comes at the worst time, but it is a nice challenge.
Just wondering, is there a way you can script wars into the game at certain years to mimic history? (You don't have to do every single european war from 500-1800 AD

but some major ones, maybe even with some accompanying units would add some more flavor to the mod.
If there are any civs in specific you want playtested, just let me know and I'll cover it.
-HockeySam18