I’ve seen some complaints about the historical accuracy of this, particularly in regard to the earliest sections, but I’m unable to judge because it’s not really my area of history at all — inasfar as I know my history anyway, which is often patchy. I simply enjoyed The Written World as a summary, from one perspective, of how some stories and books have changed the world in being written (or in the case of previously oral works, written down). Puchner writes compellingly about books I haven’t read yet, and really makes them sound tempting — The Tale of Genji, for example (though he also makes Don Quixote sound fascinating, and I did not love that at all).
It’s not the be-all and end-all, but if you love books and you want to read about some books that have been important in shaping society, then this should be right up your street (up your bookshelf?).