From MLB Power Pros Wiki

Abilities do not decrease so much when condition is poor (4)/ Somewhat streaky (3)/ Abilities increase/decrease greatly in Good or Bad Condition (2)

Ability Effect

Consistency is a 5-Scale Ability that determines the effect condition has on a player.

Players with Consistency 4 will be less prone to the negative effects of poor condition. For players with Consistency 2, the effects of Bad condition will be more severe, while Good condition will give them better boosts. The 1st and 5th scales of Consistency do not exist.