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Are you referring to the OVR and POT ratings for different tools/skills (Power, Contact, Eye, etc)? The OVR ratings determine how a player will play now. If a guy has low OVR ratings, he won't be able to hit in the bigs. POT ratings indicate how good a player's skills could become (if you play with scouts, think of this as your scout's opinion of how good each skill might become). Until aging kicks in, players' OVR ratings tend to change in the direction of their POT ratings, though as in real life, some players develop quickly, some slowly, and some not at all. So OVR ratings change all the time- but so do POT ratings. Some players receive random boosts to their POT, and many more receive hits to their POT ratings; prospects are not sure things. Other factors also play a role- aging, injuries, and the level to which you assign a player (if you put a good player in Rookie ball, he won't be sufficiently challenged, and if you put an unready player in the Majors, he might be overwhelmed).
If instead you refer to the combined OVR and POT rating in the top right of a player's profile, these are just aggregate ratings, designed to give you a rough idea of how good a player is. Virtually all minor leaguers will have very low OVR ratings- almost always one star, or 20/80 depending on the scale you use. I use stars, and often have one star players on my Major League bench, but usually you'd want players with more than one star at most positions in your starting lineup, and if you can find enough of them, for your pitching staff. A player does need to be pretty decent to get over one star, however, and one star players can be useful at the big league level- it's important to look at the individual ratings (Contact, Power, Speed, Defense, etc) to tell who might help and who won't.
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