Some types of opponents the heroes should just be able to mow down without worrying about being hit. In some games.
It very much depends what type of game you're interested in playing. You can go fully cinematic and have Arnie run across an open courtyard wearing shorts and a ripped shirt and carrying a minigun, with hundreds of soldiers firing machine guns at him and they all miss, while Arnie picks them all of easily. Or you can go grittily realistic and have Arnie be turned into a smear of red paste.
One important part of this is letting your players know which sort of game it is before they try this.
Commentary by memnarch (who has not seen the movie)
Run and shoot their way through without a care in the world? It wouldn't be a Jim plan if it made sense! The really surprising thing is how well this all is working in the movie. There hasn't been any sneaking around at all yet! Okay, so the big bad leader left the ship for a little bit, but I would have assumed Hux is at least competent enough to have a proper number of troops keeping an eye on incoming ships. Though perhaps this is a baiting trap of some sort via the Millennium Falcon? That was towed or something back along with Chewbacca, and Episode IV did have the tracking device put on the Falcon as well.
That just leaves the question of why the heroes would take the Falcon anywhere the First Order would be interested in at the moment, but that's only a small plot hole. We've got references to make and there's a bunch more left to do! All we need now is some superweapon that gets used. If we do get another superweapon, I hope it's more interesting looking than that oversized land cannon in the last Episode.
Transcript
GM: Chewbacca’s free, but the maze of corridors is full of troopers. What do you do?
Finn: Run straight through like usual.
[SFX]: Pow! Pow! {Poe races ahead, firing at troopers}
Poe: No cover, full sprint, shouting, “Pew! Pew! Big fat losers!”
Chewbacca: I daresay slightly more circumspection might be called for.
Poe: Okay, I’ll redact the “big fat”.
GM: Troopers drop like flies.
[SFX]: Pow! Pow! {Poe and Finn fire as they race down the hall, Chewie behind them}
Trooper: {falling} Aargh!
[SFX]: thump! thump! thump! {three other troopers collapse to the floor}
Poe: I slide a blaster to Chewie!
[SFX]: scrape...
[SFX]: Pow! Pow! Pow! {Chewie grabs the gun and blasts some troopers}
Chewbacca: This does feel slightly more effective than saying, “Pew pew”.
GM: Fire comes over your shoulders from behind.
[SFX]: Pow! {a bolt from a trooper passes harmlessly behind Finn's head}
Poe: We don’t even need a rearguard! Their stray fire warns us!
[SFX]: Pow! {another bolt hits Poe from the side}
GM: <roll> Poe, you’re hit in the arm from a side corridor that you weren’t looking down.
Poe: {collapsing on the floor} Wait, what?! Troopers can’t hit! That’s like... a rule!
GM: I applied suitable narrative correction factors. A.K.A. a +8 “oblivious target” bonus.
Chewbacca: A most welcome rectification to the natural laws of probability, I must say.