It's chilling, tense and scary as hell, and those are some of the bad points?
it has set views that actually add to the effect of terror because you don't know whether something is straight in front of you!
it's generally fast-paced, although there isn't actually much of a storyline to get through.
The sound leaves much to be desired as there is little but maybe it's just to add to the effect, i won't argue that it doesn't work as, in past experience, it's worked nicely.
You can't run when you aim and you can't shoot if you don't aim, plus you can't see what's in front of you unless you aim either, but apart from those small points the game is a heart-stopper as enemies are as fast, if not faster, than you and can be quite a sight when you blow their head right off their neck, and watch all the blood pour out and onto the floor...(yum).