|Bungie.net Halo read-only data|
halo.bungie.net hosts a plethora of stale Halo 2, 3 and Reach game statistics, user-generated content and blog posts by Bungie.
Since 343 Industries/Microsoft took over stats- and user-generated content hosting for Halo 3 and Reach in April 2012, this data has been sitting stale on Bungies servers since then.
The detailed statistics for a lot of the Halo 2 and 3 games have been purged already to presumably free up Bungie's resources (example of a purged Halo 2 game).
Between November 2014 and June 2015, ArchiveTeam downloaded more than 37 terabytes of Halo 2 and 3 stuff. Bulk archive files are available from here, and the content should also be reachable through the Wayback Machine.