For a SP add-up a pitchers ratings for control, splits, 1st, 2nd.
Us 50 control and splits as an absolute minimum.
Then a pitcher who's ratings end up being 340 or higher will be a servicable ML pitcher.
Around 380 you start getting a consistent All-star
Around 410 you are talking consistent Cy Young threat.
There are obviously exceptions and some categories are worth more than others but this gives a generic baseline
IMO I rate the pitching cats in the following order Control, RH, 1st pitch, LH, 2nd, 3rd. I am also a proponent of GB/FB of 60 or greater.