Then why are some players considered "AAAA"? Because people sometimes don't understand baseball. To be fair, there are players whose skill-sets for whatever reason are more conducive to minor league baseball and can never figure it out at the MLB level. We all know this. These are the guys that wind up being labeled AAAA players. These are usually players, however, who tear up AAA and AA at what would be the prime major league years, which is partly why they do so well. Success in AAA or AA at age 27 or 28 doesn't mean a whole lot...right? That said, by and large, great minor league success (with age and league taken into consideration) eventually will translate into major league success.