Originally Posted by BigThor
Why would he need an army for enchanced humans anyway, he went toe to toe with frickin' THOR!
After Thor juiced him up 4X as powerful as he normally is. Granted, he's moved on to more powerful armors since then.
But as to your querry I think the answer lies in the Superbowl IM3 trailer. Powerful armor is one thing but it's no substitute for not being able to be in more than one place at a time. Just like Tony(in armor) can easily handle all the weight of those falling people but that doesn't mean that's all it takes to solve that problem.