Sure. I think the main issue here is that there will probably never be an accurate accounting of the effects of any system, especially communist ones when empirical powers are extremely capitalist. For example, historians don't even agree that the holodomor was intentional, but most people assume it was and count that as a black mark against the USSR.

And that's without even mentioning that communism has never been given a proper chance because of the fact that capitalists have a vested interest in knocking it's legs out from underneath it at every step. So even the most accurate analysis of a communist country would not allow us to really compare the results of a capitalist world with a communist one.