Lafiel on 07 May 2008
as far as I know the infamous "AAA" ranking originally is a ranking(the best ranking) how creditworthy a person or a company is - and describes how much loan they could get from banks
in the games industry it describes how much of a financial effort is made to develop and promote a game, so it usually stands for high quality productions, which are expected to sell loads of copies, but it is not a term for how good reviews of a game are (that's how fans (miss-?)use it nowadays though)
for example Wii Fit clearly is an AAA production, although it might not get the best reviews everywhere, but it has very high production values and it's promoted very aggressively
