Some notable exceptions are Assassin's Creed series (outside of III), Dark Souls, and Splinter Cell: Blacklist.
Some of these may be oversight while the service gets cleaned up.
Complete list of excluded games: http://steamdb.info/search/?a=app_keynames&keyname=261
Some of these may be oversight while the service gets cleaned up.
Complete list of excluded games: http://steamdb.info/search/?a=app_keynames&keyname=261