Would disagree about it failing, because the presentation style is beautifully done. I would, however, agree, that it was stretched out far too long for what it is. It's not so much a scary experience as an immensely frustrating one, IMO. It's mostly a question of whether the individual player feels the presentation outweighs that.
The Alien AI is more difficult than they make it out to be, however. Not sure if that's because they were apparently on a console-based experience. Even on the easiest level on PC, permanently stealthing around, the thing still somehow knows where to find me.