It's not often that the female lead in an isekai is a tactician, and a decently competent one at that. I like it, she deserves this credit. I had very low expectations coming in to this, but I can at least appreciate her using her brains to win this battle where they were outnumbered 30-to-1. It also didn't boil down to "one swing from the almighty OP generic MC wipes out 30,000 enemy soldiers all at once, single-handedly winning the battle".
Amusingly, he's effectively functioning like a living magic wand for the female lead... at least for now.