I like it, but I can't play it back to back. I have to wait awhile and let the scares be forgotten for it to remain as scary as it was originally.
But then again, for me it was only scary until the military ship crashed (where it got tense instead of scary because of the faster enemy) and then it lost almost all of it scariness late in the game. By the time it went planetside, it wasn't scary at all.
That doesn't take away from it as a game though, combat/story were still fun and top notch.