I'm not entirely sure what you mean by 'character efficiency test', but if it is what I think it is (comparing the relative 'efficiency' of differing characters by pitting them against a set of challenges and gauging their results), then I would question the validity of the test. Different characters have different strengths, and so a test meant to measure them must involve varied challenges. "A town full of loup-garou" is likely to present only a very limited selection of challenges, the greatest of which is likely to be binary in its result: either the character is hypothetically capable of defeating a loup-garou in a physical confrontation, or they are not, with which side a character lands on is likely to depend almost entirely on whether or not the character is capable of bringing to bear an exceedingly specific Catch.