And instead of just swinging the sword or punching with the fists, you have cool moves, like rushing up to the opponent, slicing and dicing and leaping into the air to finish off your opponents.
VATs system could still be used here, paused and then target the head/arms/legs. And when you land a fatal/critical blow, you could have the head/arms/legs explode in gory detail.
Not sure how you'll implement VATs system, perhaps it could be done in pre-battle options, otherwise you'd have to wait for everyone else to finish targeting.