Agreed, some games even rely on reasonable historical accuracy. I certainly think it can spark real interest in history. Sometimes it can be fun to go "was that person real? did this historical event happen?" etc

My main concern are world war games and modern war games (not specifically cod). Many games, while accurate in some ways like clothing, weapons, settings etc, portray a certain peoples as evil or inherently bad and embellish stories to embed the player in the perspective of the "good guys"story. These stories have sub-concious effects on the brain, they teach us patterns of thinking we arent even aware of. This is dangerous, I think, when the stories are not actually real or events have been changed to suit a narrative.

Id advise extreme caution in taking anything as fact in a game.