Gamer history lesson here.
The term triple A goes back to the early 90’s with Nintendo. Nintendo started doing a seal of approval process in which the game was heavily tested for bugs in the software. Although unheard of prior to this point, Nintendo only gave the seal of approval to glitch free games, if the game got a seal it got decent marketing.(mario, legend of zelda are good example). Publishers noted that games released with this seal sold exponetial more games.
Fast forward nearly a decade. Game developers start to borrow the academic grading system a-f to grade the quality of games internally. Que Sony and their video game level completion utelizing the a-f grades. I dont remember the game but it was a fighting game marketed heavily, the highest rank you could get was TRIPLE A. So, game reviewers called it a 5/5, triple a game.
The term became used shortly after to denote a high quality game with large budgets and relatively high marketed game. That sells at the highest acceptible pricepoint at time of release.
Sadly, I wish triple a ment bug free like nintendo wanted to… Anyways, it’s an industry staple now and has a couple mentions with it. A cult following game that wasnt marketed well is a b-rating(in refrence to b rated movies, though this term has fallen out of favor). Minecraft or shovel knight for example. Also, most noticible, it seems that only triple A games have a shot at GoTY. This is due to quality of graphics, gameplay & if you guessed marketing (give yourself a cookie) of the game itself.
Pubblishers strive for the tripple A rating because GoTY editions bring in a large spike to sales for a game that shouldve devalued prior to the award.
In short, stupid amounts of money. Destiny’s 500million dollar budget contract is a perfect example of this.