Maxzor commented on Justine et autres romans by Marquis de Sade (Bibliothèque de la Pléiade)
I read only Justine.
The main question is if it is worth following virtue in one's life, given that providence can favour a sinful conduct better.
I found that the philosophical pages and the repetitive systems were like rather fun labyrinths were the reader had to learn how to refute the sophisms exposed.
But it was quite tedious. It seems to me on one hand that Choderlos de Laclos did better at painting libertinism, and on the other hand that Voltaire's Candide was more skillful at painting humans as (I oppose the thesis !) fundamentally evil.