Hard to say how any actual war would play out until it actually happened.

Iraq was supposed to have the fifth largest military on earth until we ran over then like a speed bump in Desert Storm. Admitted, they also sucked it up against Iran a decade earlier.

But just because the US sucks doesn't mean the people we end up fighting don't also suck. If we actually threw down against Russia, it would be a collosal shit show not seen since the Korean War.