Been playing Europe instead of the whole world. Couple of thoughts.
I am playing all of one side against the AI.
Seems to favor the axis quite a bit. As the allies it went to turn 15 before i was tipped the scales. As axis, i feel like i am in the winning position on turn 5, just a matter of time. I think part of that is the size of the navies.
The rally points from IW could be a good addition to this map. USA had difficulties finding a place to put a new factory.
Germany and USA had fairly similar colors. Germany was also similar to one of the Balkan nations, but that isn't as big of a deal, as they are allied.
After like 2 turns, iron was not much of a factor for me. I don't know how much you wanted that to be a factor, but the fuel is what really limits things for me. AI seems to use more of its iron though.
SS troops seem to need a higher TUV value. They are picked first for casualties.