Napoleon's marshals, a point of comparison

Is it me, or does the Napoleonic literature treat Napoleon's marshals as bundles of individual attributes, excellent at this or that, not suited for that or this; while the Civil War literature is "judgmental," demanding of every general the same all-around excellence under all circumstances?

In other words, is the Napoleonic literature mature in comparison to Civil War nonfiction? Certainly, it has had longer to mature, but I see this in even its earliest histories.