Players like fighting villains and henchmen and evil races and people who generally get in their way. But every once in a while it's nice to have a fight against something that just wants to eat them.
Then the clever tactics need to deal with somewhat baser instincts.
Han: You'll be okay! Just stay still.
GM: A tentacle stretches up and pulls the last skiff guard into the maw.
[SFX]: slice slice
Sarlacc: Brain analysis commencing.
Sarlacc: Preliminary report: "Damn, I shouldn't have stayed still."
Han: Stay still and don't look delicious.
Lando: I don't know how to not look delicious!