The Mexican League is officially classified as Triple-A in the Minor League Baseball system. Unlike the International League and Pacific Coast League, none of the teams that compete are affiliated with a major league team. However, one similarity that it does have with the IL and PCL is that it is filled with ex-major leaguers hanging on.
Another thing about it of note is that it is an extreme hitters league. Just as an example, there is a player named Rodolfo Amador, who plays for the Acereros de Monclova, the team who finished with the best record. You probably aren’t aware of Amador, and for good reason.