When measuring the Colt's front office drafting strategy and performance, they don't have to be perfect, just should just be better than all other teams in the NFL. This relative performance can be measured. It isn't a subjective, arbitrary value. It's often dumbed down to a simple letter grade, like in grade school.
These techniques are used by all sorts of companies to evaluate strengths / weaknesses the competition, and to do self-assessments for future improvements over a period of several years.