When I started playing video games they were all made of pixels.  Tiny colored blocks stacked on top of each other to form shapes.  The hero, the enemies, the background were all made of these blocks.  Now games are made of millions of polygons and graphics have taken amazing steps toward realism.  Our nominees for this award:

Rage
L.A. Noire
The Elder Scrolls V: Skyrim
Battlefield 3