I've been reading his "Parallel Lives" and it's clear part of the goal is to tell how some fundamental characters lived, so people can know their stories, but the other part is to set and reinforce a moral standard of roman days. Discipline, self-devotion, humbleness, courage and so on. It's like he's trying to update Homer and Hesiod myths, but backed by tought research (considering their standards).
What impressed me is that I've been watching documentaries (from the 80's or 90's probably) about those days and they don't differ much from Plutarch's books.
So, can we consider him a historian in the present time?