Does seem to be US console-centric,
Port 666 in windows is Doom, I think that counts as popular culture regardless of whether you were "legally" old enough to play it.
Elite, Baldurs gate, worms as the first game you could play on your nokia phone, or solitaire for that matter.
I agree with the six as a six, but why six? Why not ten?
And age specific, WOW is newish, but half life set a benchmark for what can be done in a game (and the market that is valve / steam changed the way we consume games digitally and not on a disk.
Battlefield 1942 brought in multi online, pic k a vehicle and respawn type games that changed the market again. (then cloned into a cash cow for EA)
Biting the hand that feeds IT
