I may have used the term "outstanding" in a confusing manner. What I meant to imply was spin rates might prove useful in the absence of some kid having great numbers ("outstanding" in my initial comment) for mph or KO's. Did not mean to imply that the metrics themselves were outstanding metrics.
AS for high school stats, it sounds like we are generally on the same page as to the usefulness of high school stats, although our reasons why such stats are not terribly useful may not line up perfectly.On my point about competition, you could have very valid stats for a team's pitcher showing solid performance (low ERA, high KO's. low walks, etc) but unless you are able to backtest the batting averages of the opposing players (and maybe the pitchers they have been facing all season long), you cannot assume he is pitching against top talent, at which point the stats have less impact.