:
Dark side
Twisted mirror
Unique kind of humour
Intelligent engadgement
fantasy misticism
Sci-Fi at it worst
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Perfect, You've kinda stole my words.
I'll add this:
Hard from the very beginning.
Always the puzzle element. (If there can't be a puzzle element, just put in the good old voice lock.)
Nature.
Hate and fellowship. (including Racism and such.)
Tenseness.
Relaxed, mystic, secret and stimulating (in the way of being alert and quick minded) music.
Nice sound effects. (alarms, gunshots, gamespeak)
A Realistic element of being. (The realistic functioning of the body and adapting to environments over time.)
And the last I can think of: Dark and realistic graphics.
Edit:
And oh, Ofcourse. The (hard) secrets. They should start making those again.