Yeah, my first thought was the Tamriel map as well. I think every continent on there is overvalued, especially with the possible additions of embassies. Any time I play that map I get dominated by someone who manages to caputure Hammerfell/Skyrim and expand across the whole left side.
The nice part about Africa is that all 3 border countries are connected. So whenever someone breaks into your continent its really easy to recapture. The same is true for most of Europe (except the Iceland border). Whereas a continent such as North America has 3 borders spread far apart so they can't reinforce each other. Overall I think the classic map is a model of balance, but maybe that's just because its the model for most other maps
