Uma Thurman has so long to screw around between attacks that at one point, she reaches up during a clashing of swords to pull a guy's eye out. And while he's screaming, the other 87 sword murderers stop to let her pose. One would imagine three or four of them would think to stab her, and 40 or so would think to throw their sword or go look for a gun.
Yes, movie henchmen and henchwomen have long had a tradition of attacking one at a time, giving the hero plenty of time to dismantle them in an orderly queue. Entire schools of martial arts have developed to make henchmen look like they're doing something while they wait their turn to attack the lone good guy. Unfortunately, no one studies these in real life.
It's really hard to anticipate the moves of one opponent, and even world-class fighters get hit all the time when they're totally ready for it. If two or more people are attacking you, you're going to get hit. And if any of them think to grab you, which is both an obvious strategy and a natural instinct, you'll soon find your martial arts moves limited to screaming and wiggling.
"Guys! Guys, why aren't you helping! Guys, I think he's tearing my balls off! Stop posing, you assholes!! AAIIIIEEE!"
The above scene is from the kung fu classic Ip Man, which features a battle between Donnie Yen and ten karate masters, and those men are so careful to attack in order that they stand back and watch as he throws their friend to the ground and hilariously tenderizes him with punches for ten seconds, or about 500 times longer than it would take to walk over and stop him.
"Ip Man! Ip Man! IP MAN IP MAN IPMANIPMANIPMANIPMAN!!!"