This review may contain spoilers. I can handle the truth.
The first third is great. The alien on the lander all happens so quickly, and is so intense and scary. Aliens sure gestate quickly these days.
The middle third is quite a different film. A ponderous exploration of the insanity of David. It takes its time—thinking of the fingering scene—but ultimately I'm not sure it really paid off. David didn't become a focus of the story, that perhaps he diserved.
The final third was exciting, and then ruined by a…