There is no other way to find out whether the game is AAA or not other than to look at its metascore.
- Looking at sales figures is not an option because the gap between certain jRPG titles (FF, Pokemon) and other games in the genre is way too big.
- To judge it based on opinions of hardcore crowd is not an option either. Such debates can last forever.
So: AAA = 90+ metascore. Simple as that. There is no reason to make it more complicated.







