Jet Set Radio - Great Cell Shading
ICO - See Kawaii ↑
Half-Life 2 - Incredibliy good Textures
DooM 3 - Insane Lighting
Guilty Gear XX - High Rez 2D graphics
Metroid Prime - Atmosphere

That is all. I picked games that I feel represent the best in what they do. I have yet to see lighting as good as DooM 3 or Textures as good as Half-Life 2. I have yet to see an atmosphere that matches Metroid Prime. I have yet to see a Cell Shaded game that sports as much style as Jet Set Radio. Its all there.