lqwertyp
Chieftain
I voted immortal. For me it's the best difficulty because I can beat the ai on any victory type without trying the same strategy every time (archer or knight rush). Deity is winnable but not in a fun way for me.
Emperor is my pick, combined with a mod to eliminate AI's free settler, because its the last difficulty level which allowes a bit of roll playing. I can beat deity easily by warmongering but I don't want it to be the only way to play this game.
It should be renamed "The difficulty level formerly known as".I didn't think we were allowed to play on Prince anymore.... you know, since he died and all.
I unfortunately haven't been able to find any such difficulty due to the way the AI's bonuses are front-loaded. Any difficulty where the late game is challenging has dramatically constrained options in the early game (competing for early wonders/great people requires an investment disproportionate to the reward, and attack by a numerically/technologically superior force is essentially inevitable).
AI in general is not there yet. Basically every game increases difficulty with bonuses: i.e. RPGs don't get 'smarter' enemies, they get more enemies and/or the enemies get more HP/damage. Strategy games give the AI bonuses. Etc. Unless a game is reaction-time based (and the computer can move/process faster) - and even then that's still not the rule (see most FPS games), or something like chess/go which is simpler and has tons of data to decision points for machine learning and the like.I wish they would put more resources into designing a more challenging AI as the difficulty increases instead of the lazy concept of granting it absurdly high bonuses.
Didn't Dota 2 recently get an AI that could beat the best human players, even when it's input speed was limited to that a human?
It's possible that current technology does exist that allows an AI to be built that can challenge the majority of players on this forum. But the resources required to do that way exceed anything available to Firaxis. Bonuses are the only practical way to make a moderately challenging AI at the moment
Nevertheless, the current state of the AI is still particularly shoddy.
The poll is turning out a nice normal distribution curve, with emperor being the center peak. The developers and statisticians are happy as a result.
... and there was less rejoicing 
But, to be fair, the population responding to the poll are visitors to the civ fanatics website, so one would expect the mean to be higher than the average Civ player.... except for the fact that there are actually three more easy difficulty levels that the poll creator chose not to include, so actually it is heavily skewed to the more difficult end of the spectrum... and there was less rejoicing
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)(Then again, the average owner of the game has not achieved the steam achievement for winning at settler level or higher.)
The poll is turning out a nice normal distribution curve, with emperor being the center peak. The developers and statisticians are happy as a result.
