On the other hand, part of what supposedly made humans distinct (though not superior) was their wide genetic variance. The other races were more specialised, with a narrower focus on how they adapt.
Perhaps that's why the human husks are so weak. They're not good at any one thing to make it a significant tactical advantage. Indeed, maybe the same was true of the protheans, which is why the collectors are also generalists. Who knows, if this cycle's war went on for a few centuries, perhaps the human husks would continue to be refined and develop along similar lines.