No other game has come close in the
atmosphere department so far.
No other game has had me nearly pissing in my pants and having a heart attack simultaneously.
No other game has made me feel "in there" the same way.
It grabs hold of you and doesn't let go until SHODAN is sent to /dev/null. And afterwards you feel like going back to it again.
Made in 1993, it still puts all other FPS games to shame. Last year a sequel was released, and is not bad either. But the original 'Shock is just something special.