For good, for bad, for ugly.
This is not a list of the best books of the decade. (This is, if you’re interested.) This is a list of books that, whether bad or good, were in one way or another defining for the last decade in American culture. (A global list would be nearly impossible, for obvious reasons. Accordingly, I’ve hewed to English-language and/or US publication dates, when relevant.) This is a list for general readers and followers of literary culture; it includes both major bestsellers and literary standouts, books that have become pop culture phenomenons, and books whose influence has been quieter and/or localized in literary circles. Obviously, it would not suffice for specialist purposes—I imagine a scientist would have selected a very different list of 100 books. (Or 100 books give or take: on a case by case basis, I have counted series as single books, or let the first book in a series stand in for the whole.)