So close and yet so far... (scene from Final Fantasy: The Spirits Within animated movie)
There are over 50 muscles in the human face. Those muscles that control expression make the face an incredibly mobile part of human anatomy, capable of both extreme and subtle displays of emotion. The skin that lies over those muscles is highly elastic. It stretches and creases, wrinkles, bulges, and puckers. While catching every last subtle motion of the face isn't impossible, it's certainly a herculean task to ask of an animator, much more likely to end in failure than success. Even Squaresoft, who spent nearly enough time, money, and talent to bankrupt itself on an incredibly ambitious movie failed to perfectly cast the illusion of true human expression. Video game budgets are much tighter on all resources, thus, when photorealism is the goal, the end result typically ends up squarely in the Uncanny Valley the moment the camera focuses on a face.
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