I think it just comes down to an overall portrayal in RJ's universe of a general state of reality in his universe, in which males need to get ahead or gain status by showing fighting prowess or demonstrating/exercising their strength, while females get ahead or gain status by showing cunning and increased intelligence.

As a result, the male upper tiers are weighted towards men who possess one factor, while the female upper tiers are weighted towards another factor. Both can achieve the dominant position in the overall hierarchy, but neither side possesses an overall advantage in the long run. After all, strategy is not the same thing as being successful as a general.

After studying "The Art of War" by Sun Tzu, for example, the best victories were the ones in which the battlefield victory was determined before a battle was even fought - in this case, if Moghedien has defeated her opponents, and appropriated to herself their status, belongings and territories through superior cunning, it doesn't really matter if she was good at using her troops or accompanying them to the battlefield - the key word is "victory".

Ironically, strategically speaking, among the males named as the best generals are two that have permanently been defeated, one who was defeated by a far weaker opponent during a battle when his tactics should have given him a greater advantage and one is often criticized for planning such elaborate and risky maneouvers that often he was beaten or matched by opponents who didn't try to implement the "perfect plan" in order to gain recognition of genius.

It seems to me that the female Forsaken are the more skilled strategic and tactical thinkers - they're the ones surviving and most of them are concentrated on total victory rather than risking winning each battlefield just to lose the war.

"This person is a great general" doesn't necessarily mean much beyond a general statement that they have accomplished much on various battlefields. The "best generals" IMHO would be able to defeat their opponents before war was declared. So the terminology is rather vague - especially since we're not really aware of finer points of the duties of generals during the Age of Legends, nor the skills that were required.