Game Informer Online, 1/11/2008:
Aggregate gaming sites typically compile reviews from all over - including Web sites, magazines, newspapers and TV programs - and churn out a number that represents the average response to a typical game. The closer that number is to 100, the higher its average positive response.
Game Informer thought it would be interesting to see how the various platforms and publishers fared against a large base of averages, so they took data from Gamerankings.com, ran it through their own spreadsheets and compiled the results. This isn't meant to be an exercise in hardcore statistical analysis, so take it with a grain of salt. Because Game Rankings exercises its own opinions as to which sites do and don't make the cut, there's plenty of room for human error and opinion. Instead, think of it as an interesting look at the gaming landscape as it stands today.
Game Informer also lists the top 10 and bottom 10 games for each of the platforms, according to the aggregate score tracker Game Rankings. (Page 2)