Falconiano
Prince
My take on Germany and Japan:
Germany
Furor Teutonicus is fine as it is, it's actually a really good ability esp with the honor tree as it allows you to farm barbarian camps to become wealthy or build an army, it gets even better when you change the game speed to epic or marathon.
Landsknecht are actually good good as they counter mounted units (100% bonus v.s 50% bonus) , and are cheaper than the pikeman that they replace (45 production v.s 90 production).
The Panzer has an additional 10 combat strength as well as an additional movement, also fine as is.
So the real question is how can we make this civilization any better? What i'd also suggest is Furor Teutonicus giving an additional bonus v.s barbarians like 25%
Japan
I know there are alot of people that think bushido is subpar but i've always had good luck with the ability and think it's one of the stronger UA's in the game when fighting another domination civ. Samauri on the other hand are really subpar . As it stands the promotions they get are nice but i think they should just be given a unique ability where they deal double damage while counter attacking (I.E being enganged by another melee unit while fortified) This will represent the counterattack style of the katana.
The Zero doesnt work very well with this civ as it comes so much later than their first UU, I'd honestly just remove the damned thing and replace it with a unique UU called a ninja that has 2 tile range stealth against military units and only unstealths when attacking a civlian unit. I'd have them appear like merchants of venice for Venice. This unit would have unique promotions that would improve stealth and later allow it to sneak attack military units.
This change alone would make Japan a better and more unique civilization.
Agreed that Zero is the only thing really in need of change, and perhaps Samurai needs a better ability.