Rahvin was killed in the most improbable way imaginable:

Rand attacks him with an angreal (which probably doubles his strength), and Rahvin reacts by still managing to draw Rand into a territory that provides Rahvin with a strategic advantage. One of Sun Tzu's famous truths is that you must try to choose the territory that suits your strengths rather than your adversary's. Full marks to Rahvin. Unfortunately, even Sun Tzu himself could not have predicted that Nynaeve - totally untrained in TAR - would somehow capture Moghedien - the most skilled user of TAR EVER - and entrap her in an adam.

Nor could he have predicted that while this happened on the other side of the continent, that these two would happen to find themselves in the TAR version of Caemlyn, of all places.

And now for the most unbelievable coincidence of all.

Not even Nostradamus himself could have predicted that all of these totally random events would happen to take place at EXATLY THE SAME MOMENT that he happened to draw Rand into TAR.

Faced with a massively improbable sequence of events of this magnitude, Sun Tzu, Karl Von Clausowich, or even Alexander the Great himself might as well have thrown in the towel before they even started planning the battle.

Same goes for Sammael, who did everything by the book, drawing his foe into a terrirory he had prepared beforehand, only for Moridin to interfere and save Rand.

Compared to these two male Forsaken generals, Semirhage's plan was absolutely idiotic, and certainly not properly thought through.

Based on these three examples, the males are already demonstrated as having greater aptitude for strategy than the female generals.