That depends entirely on what type of book is being wrote. If I write a history textbook that goes into intricate detail about the Time Slip of 1662 and the Lost Years, and the eventual Realignment that resulted in the Great London Fire, am I being more useful than a critic who points out that my history textbook is full of factual inaccuracies?
I'll take one responsible author with one harsh-but-knowledgeable critic over a hundred would-be authors without the ability to sift useful content from polemic criticism.
