You don't actually seem like you're disagreeing with me though? I spoke only to the form of government as it pertains to end results, not to how we should attribute "points" to a given ruler or politician. Credit assignment is similarly difficult when it comes to voters and elected leaders.

The end result is higher variance over a long period of time as a dictatorship switches between good and bad leadership. Meanwhile democracies consistently fail to execute on large scale visions. There's a reason corporate structure generally resembles a dictatorship, and that same reason is what eventually leads many of them to fail.