I havnt checked but i throught Metacritic did as well.
Thats a shame, Maybe Metacritic can gain access to Gamerankings archives and use the missing info into there own site.
I just checked some SNES games I know had scores on Gamerankings and they were not even listed in Metacritic's database. Super Mario World was listed as a Wii game and a GBA game. Super Mario World 2 didn't exist at all.
NNID: theRepublic -- Steam ID: theRepublic
3DS - Currently Gaming Like It's 2011 - The Legend of Zelda: Ocarina of Time 3D - Master Quest
PC - Currently Gaming Like It's 2012 - Borderlands 2
Mobile - The Simpson's Tapped Out and Yugioh Duel Links