The Thief games are never off my HD.
I may seem incongruous, but the Thief games are very, very similar to games like SH3. There's an awful lot of quiet, cautious movement, stealthy observation, the weighing of risk versus reward and that nice balance of power where you have an ultimate advantage while you remain hidden, but as soon as you reveal yourself (or are detected) are incredibly vulnerable.
Thief 1 & 2 and SH3 are the only games where, after a play session I am left feeling a kind of mental and emotional exhaustion from being so drawn in to the atmosphere and being on edge the entire time.
Great games.
Edit - this isn't including Thief: Deadly Shadows, the third game, which is an abomination for a multitude of reasons.
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