If I had to pick one desert isle game, it would undoubtedly be Thief: The Dark Project. This first and still foremost sneaker remains my all-time favorite game a decade after it fired its first water arrow, due to atmosphere as thick as Heidi Montag and an incredible sense of freedom. Even though this was the first game about slinking through the shadows and conking bad guys over the head, the levels were wildly freeform. I've replayed Thief and its Metal Age sequel a good two dozen times over the years, and I don't think I've stalked through a mission the same way twice.
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Review: Firingsquad