It's clear to any frequent player that British and French are the most played nations, with British by far #1 for the mid to advanced age players. I don't really want to nerf them, but I do have a few suggestions to compel more players to pick other nations. Here are my suggestions:
Japanese: They are defense-oriented historically, so why not give them +10% health to all defenders. This would make it a powerful choice for world war defense, and be on par with the German offense bonus. I would also suggest buffing the damage of the town center at later ages. As is, the only perk the nation has is the longer peace treaty, which is pretty useless to most players who participate in war or wish to advance quickly. The unique unit is exactly the same as the German unique unit, but the German nation offers many more perks. The shooting town center is useless in later ages and does not affect the battle.
Greek: They are architecture-based, so give them +10% health to all buildings. Again, this would make it a more interesting choice for war and defending. As is, the national bonuses are not useful at later ages and the unique unit is very lack-luster. For an even easier sell, perhaps make the time-reduction perk percentage-based instead of just +15 min. 15 minutes on a 14-day build is meaningless, but if it were, say 10% reduction in time, it scales across ages much better.
Chinese: I think they pretty close to being good as is. I would suggest increasing the DPS of the unique unit by a modest 5%. It's still incredibly misleading for players to see that the unique unit fires twice as fast, and incorrectly assume that means +100% DPS (nowhere does it tell you the actual shots do less damage!!). As is, they are at +20% DPS, which is a tough sell when comparing to British (+15% DPS and +1 range), Korean (+40% DPS), and German (+15% DPS with Fury, along with every other unit). At +25% DPS instead, they are an easier sell.
The rest I think are fine as is. This is an overdue change to buff these nations as they have suffered for a long time.
Japanese: They are defense-oriented historically, so why not give them +10% health to all defenders. This would make it a powerful choice for world war defense, and be on par with the German offense bonus. I would also suggest buffing the damage of the town center at later ages. As is, the only perk the nation has is the longer peace treaty, which is pretty useless to most players who participate in war or wish to advance quickly. The unique unit is exactly the same as the German unique unit, but the German nation offers many more perks. The shooting town center is useless in later ages and does not affect the battle.
Greek: They are architecture-based, so give them +10% health to all buildings. Again, this would make it a more interesting choice for war and defending. As is, the national bonuses are not useful at later ages and the unique unit is very lack-luster. For an even easier sell, perhaps make the time-reduction perk percentage-based instead of just +15 min. 15 minutes on a 14-day build is meaningless, but if it were, say 10% reduction in time, it scales across ages much better.
Chinese: I think they pretty close to being good as is. I would suggest increasing the DPS of the unique unit by a modest 5%. It's still incredibly misleading for players to see that the unique unit fires twice as fast, and incorrectly assume that means +100% DPS (nowhere does it tell you the actual shots do less damage!!). As is, they are at +20% DPS, which is a tough sell when comparing to British (+15% DPS and +1 range), Korean (+40% DPS), and German (+15% DPS with Fury, along with every other unit). At +25% DPS instead, they are an easier sell.
The rest I think are fine as is. This is an overdue change to buff these nations as they have suffered for a long time.