Really impressive work here. Thanks for sharing. :)
So, the data seems to show that the start of each generation produces the best-reviewed games, then? 2001 to 2003 (6th generation) has over 30 titles with 90+ metacritic score. 2007 to 2009 (7th generation) > 25 titles with 90+ metacritic. Not true for the 8th gen, though. Maybe it will take longer this generation to get the really good games everyone is waiting for?
It'll be awhile before I figure out how to do one of these. :P