If you watch martial arts movies you should know that the attackers wait in line and only attack once the previous one has gotten a beating :). They never attack at the same time.
People with good tactical awareness make sure they never face more then one opponent at the same time. They survive to tell the tale. Down the line mediocre movie makers recreate the situation in a contrived way. Rinse repeat. Eventually the whole thing is a simulacrum. You're expecting a classic kung-fu movie battle, and that's what you get.