I enjoyed reading the other reviews on this book and empathized with those who found Derrida unnecessarily dense. His essay, "Structure, Sign, and Play in the Discourse of the Human Sciences," for example, though important, certainly lacks a riveting prose style.
In my own (possibly simplistic) interpretation, deconstruction works--impossibly, of course--at ground zero. It is an attempt to flatten preconceptions. Derrida explains in Of Grammatology
, how Rousseau's writing subverts the nature/culture binary he tries to promote. In any work, a particular word or concept will be privileged. Rousseau favors the concept of nature and theorizes that natural man, free from the corruptive influences of nature, was basically good. Derrida, bringing in his theory of supplement
demonstrates how culture "always already" inheres in nature, as writing does in speech.