@Que
Yeah, I think these days and age - in the world of different mediums of games, movies, books, franchises, sub-genres, series, sub-series, and whatnot - certain things just have their own actual canons.
Sometimes, these might overlap and a game might be right in canon with the film - i.e. say Matrix movies and Enter The Matrix game; Butcher Bay game ties right into Chronicles of Riddick movies.
I'd consider the Batman comics [which might have its own certain different canons, BTW - I don't really follow them, TBH] to be in a different canon than the Batman Arkham games.
I'd consider Nolan's Batman series of movies with Batman Begins to TDK Rises to be its own Trilogy of films with its own canon.
I'd consider Tim Burton's Batman movies to have its own canon, also.
I'd consider Batman Arkham games all in their very own canon - since they're all WB-published; yes, even Arkham Origins. AO doesn't stomp on anything Rocksteady did, storywise + character-wise - since AO takes place a bit before AA.
I'd consider the Core TR's to have nothing to do w/ what Crystal Dynamics had done.
Games made from TR Legend to TR Underworld is its own series from CD.
TR 2013 is the start of a BRAND NEW TR series from Crystal.
And since Disney doesn't want to consider KOTOR games in their overall SW canon
and only consider 7 SW films canon - screw 'em. KOTOR series, for me, is in its own KOTOR canon. These games, both KOTOR 1+2, are too great for gamers to ignore.
You get the picture.