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To be honest, I just take the ratings at face value. I put the most importance on stuff, just like most people do in real life (i.e. "he's got electric stuff"). While velocity and movement play the biggest role in a fastball, to me, good stuff means that his other pitches are "plus pitches" -- his curveball and slider might be great out pitches. Pure stuff just makes batters miss.
Then I rank movement next. Movement has more to do with the fastball, but movement is also what some term "late pop." Basically, movement keeps the ball off the fat part of the bat.
Control affects walks and, indirectly, how many pitches a guy needs to get out of an inning. For example, a guy with an edurance rating of 9 but a control rating of 4 might only go six innings; he can throw 120 pitches, but those 120 pitches might only get him through six.
So by taking those at face value, it would stand to reason that stuff equates to hits allowed and strikeouts, while movement equates to homeruns allowed, and control refers to walks allowed.
And that's pretty much what everyone else who has done a study was found.
Basically, just look at it like you were a big league scout.
You have three pitchers in front of you.
One throws great pitches.
Another one's pitches have a tailing action and late pop.
The third guy has pinpoint control.
Which one do you want the most?
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