You came up with your own way to asses the draft which is fine but it still has a number of subjective elements. Most notably as you point out is the difficulty in defining a hit. However my main objection is your dample. If you only picked good teams to assess your sample is biased. Without the bad teams we cant get an average. Moreover a reputation for drafting well does not actually mean they did. Its curious as to why no one has ever published a really good methods paper on grading a draft.
