Laura M. Brown, the author of "How to write anything", offers commentary and advice in her Huffington Post article "The do's and don'ts of book reviewing". Here is a preview of what she has to say:
"Book reviewing used to be the purview of the elite. Now, thanks to the Internet, everyone's a critic. Your online book reviews can make a real difference: people almost always scan the reviews of a book before they make a purchase decision, and your insights can be a big help."
Read more here: http://www.huffingtonpost.com/laura-m-brown/how-to-write-a-book-review_b_5187212.html