Part of a good game may always be how the AI enemies react. An article on AIGameDev goes behind the scenes of Thief and looks what makes it tick.
[A] sensory system is a pipeline for managing information about events that occur in the game. If you implement this right, it shouldn’t be limited to any of the human senses. You can easily fake any kind of sensation by pushing information into the pipeline at the right place.
This is the article that got me into wanting to play Silent Hill 2:
In the ongoing evolution of computer games towards a mature art form, we see many blips on the radar that fade away after some time. But there is one game that never goes away. Silent Hill 2. There’s something about that game that is so intensely inspiring, beautiful and moving that it continues to give hope to everyone on this path.