Tiberias
Chieftain
I know it's been mentioned before, but the overall research rate is too high. Game after game after game, the research rate is 100-odd years ahead of schedule. The primary culprits are a surviving Rome, as well as the other Europeans; France, Britain, etc. The primary impact on playability is to make it more difficult for isolated or late-arriving powers, and considerably easier for the Europeans.
One simply fix would be to neuter the research bonuses. Do the Europeans really need any kind of bonus? They have multiple neighbors and engage in tech-trading on a very regular basis, which would, in my opinion, effectively capture the very reason why they were ahead in technology historically. The bonus, in my opinion, is redundant. The penalty for certain old-world powers makes more sense; they were resistant to technological change and lagged behind, so there may be a justification.
But toning down the research bonus--especially for Rome, to limit runaway Roman victories--would be an important step to balancing the game, in my opinion.
One simply fix would be to neuter the research bonuses. Do the Europeans really need any kind of bonus? They have multiple neighbors and engage in tech-trading on a very regular basis, which would, in my opinion, effectively capture the very reason why they were ahead in technology historically. The bonus, in my opinion, is redundant. The penalty for certain old-world powers makes more sense; they were resistant to technological change and lagged behind, so there may be a justification.
But toning down the research bonus--especially for Rome, to limit runaway Roman victories--would be an important step to balancing the game, in my opinion.