[...]Once it's introduced, the Alien becomes an ever-present threat for the remainder of the campaign, and in true horror fashion, it's scariest when it's not around. The sound of something crawling in the ceiling is constant, and the realization that your own actions could bring it slithering from a vent in search of murder is truly disarming. If you sprint down a corridor, it might hear you. If you trip an alarm, it may join the party. If you find yourself caught in a fight with survivors or synthetics, the beast may come a-running.
Or it might not. And it's this sense of risk, this sheer unpredictability, that turns Isolation into one of the most effective horror games I've ever played.[...]
Sega, all I have to say to you directly is ... you're forgiven for Aliens: Colonial Marines. You earned it.
Bottom Line: Alien: Isolation can be frustrating, but it's mostly terrifying in a near-perfect way. The Alien is scarier than it's been since Ridley Scott first showed it to the world, and the atmosphere is thick enough to cut.
Recommendation: I won't lie to you about your chances ... but you have my sympathies.