I think this is interesting.
MTW does really have some educational value.
But I would agree with el_slapper: it is biased to appeal to nationalities to which game marketers are hoping to sell more of their product.

Somebody mentioned Romanians here.
How about Lithuanians?

It always puzzled me how somebody can look at Medieval European map of 1400s and not be interested in a country that is one of the biggest on the map.
In American college history textbook, Lithuania was shown biggest on the map (1400s), but there wasn't a single sentence about Lithuania in that textbook

may sound profane, but history is written by the victors... current victors, that is...