Culler compresses Roland Barthes' scholarly arc to a readable length, allowing us to grasp his development in a way that would take years of study if we rely on original texts. Since Barthes' work covered literature, cultural criticism, politics, sexual customs, and more, this summary is necessary to find what specialized scholars need from his corpus. Collating Barthes' varied thought experiments into a lucid narrative lets us isolate ideas useful to scholarly goals, focusing our productivity rather than flinging ourselves at the mass of Barthes' work.
Readable in plain English yet intellectually dense, Culler's summation is a great place to begin in Barthes study, especially for time-strapped readers. Copious citations and a thorough appendix of Barthes' works allow convenient cross-reference and simplify the selection of appropriate sources. New content discussing how Barthes' reputation has fared after his death updates the content through the year 2002. I recommend Culler's introduction for its clear, cogent, straightforward approach to a painfully subtle mind.