Just because something can be done does not mean it should.
I may be different to many folks here but I would rather play the likes of Mario brothers on the Wii with its cartoony graphics than the likes of Alien v's Predator with unlimited numbers of polygons and incredible detail. It would scare me and hopefully any other sane person witless.
Some things would be far too scary and in my opinion avoided at all costs.
Its called 'desensitization'. The more scary or repulsive stuff you see, the less scary and repulsive it becomes.
You don't want incredible detail? How about this game, would it not be cool to have the ships and stuff look as good as in the movies?
It's far more likely though to encounter a bear in the woods.
The non-desensitized flight or fight response will likely get you killed with a bear. Running = dead; fighting while scared witless = dead. With a bear, you want to be desensitized as it lets you retain clearness of thought. FoF is an archaic hold over from our non intelligent ancestors. Humans are weak, but very, very intelligent. If we can't use our intelligence against a physically superior threat, we're dead.