One of the weaknesses were that they were short they they couldn't hunt as well.
One of the strengths fro them was that they lived in a group and living in the group because you get more protection as a group. Another strength would be that they are very smart so they could create tools for them to hunt. The last strengh is that they could dig holes and traps for animals.
To be one of these humans it would be hard to live because you would be very short and you would have to live in the wild and you need to know how to cook and hunt properly and have no home.