Just got back from the seeing the movie with my wife.
Her observation: ace bandages don't make good underwear.
It does look like the crew got hit with a bucket of stupid.
When you first arrive at a new planet, you launch satellites to scan it for weather, life, and structures. You don't just cruise on down and cast about looking for whatever pops out.
You don't beam down to the planet without weapons. Even Captain Picard knows that, and he's way more enlightened about humanity not being all warlike and crap.
When the android is behind the group aways poking at the wall and suddenly holograms pop up, don't you think you should look at what he did? Let alone when he starts tapping on the pad at the door. Clearly it's time for a WTF talk with the android about showing initiative. Milk-blooded bastard, meet baseball bat.
3 adults looking at art on the walls can't keep track of the android with pokey paws in the same room who is clearly futzing with the jars just like you told him not to.
the geologist who launched the scanner pods for mapping would not have gotten lost.
the geologists who got scared by the giant dead bodies would have been doubly freaked by moving goo and penisnakes. They would have waited as close to the entrance of the structure as possible so they could get back to the ship quickly and avoid finding anything worse.
When you are an evil android (as I had to point out during the intro that he would be evil), the scientific method doesn't go out the window. You scan wierd black goo with tools BEFORE you put it into a human's beverage.
When you get sick, and notice kinky tentacles in your eye, you go see the doctor, not lie about it. You are already pretty screwed up and aren't just going to get over it like a cold. After all, you have TENTACLES in your eye.
Despite the androgenyzing ace bandage undies, Charlize still has nipples.
It would make more sense to keep grampa in bed until first contact or super science is actually found to use on him, rather than so he can be there to pester the alien right after waking him up from his nap. Because seriously, your problems are less important after a long nap than peeing, food, and killing the jerk who woke me up.
Being the last 2 humans on the planet, what are the odds that the alien spaceship is going to come down right by you AND roll after you, and fall over on top of you. I'd say 50/50. Because every other time a drop a penny, it rolls toward me and then falls over onto my foot.
Having just crashed back onto the planet after having my ship rammed, and surviving the fall, and still not having had a good pee, why chase after the human, instead of heading for a back-up site's ship. Then you could take off, and nuker her from orbit, which has long been acknowledged as the best way to take care of pesky species problems.