Peter Wilby concluded his New Statesman review in January 2006 with the comment that "All journalists should read [this book], because the Davids make a case that demands to be answered".[4] He felt the book had some flaws, in particular he objected to their suggestion "that properly radical papers should refuse, say, airline ads. The effect would merely be to bankrupt any paper to the left of the Mail".[4] Reviewing the book for The Irish Times, Eddie Halt praised "their excellently researched accounts of undeniable media bias", which he says "asks serious questions about the elite media".[5] O'Neill thought that "there is some good material here, especially on the liberal media’s servility during times of war".[3]
According to Jeff Sparrow, writing for The Age in 2006, despite possessing "something of the child's naive obstinacy in the authors' refusal to accept the journalistic practices at which most people cynically shrug", within Guardians of Power, Edwards and Cromwell "expose the fundamental contradiction between, on the one hand, our need for information about the world and, on the other, the need of media conglomerates to deliver returns to their shareholders".[6]
Exempting the Statesman from his point, the journalist and documentary film maker John Pilger, in a column published nearly two years later, said of the book, "Not a single national newspaper [in the UK] reviewed the most important book about journalism I can remember."[7]
