Tensei Kizoku, Kantei Skill de Nariagaru
An ordinary salaryman dies one day and is reborn as Ars Louvent, the son of a noble. Although he isn't talented in magic or swordplay, he does have one skill that no one else possesses: Appraisal. Using this ability, Ars can determine a person's current strength, how much potential they hold, and where their talents rest.
This skill is especially useful in the present situation of the country. The government is corrupt, revolts occur more often...