Military hardware is only as good as the personnel that operates it. China may have millions of "men", but their training leaves a lot to be desired. They, in their attempt to mimic the aerobatic exercises called "the cobra", have effectively turned the Soviets' most superior jet fighters into expensive lawn darts.
You forget the basic Chinese tactic during the Korean War - sending wave after wave of PLA attempting to make our machine guns' barrels melt. They probably have more bodies than we have bullets, and they won't hesitate to use them.