1) Brutally honest blogger: This type of blogger believes that s/he is giving the reader a service in sharing an honest opinion that might save another reader some money. For most brutally honest bloggers, I believe they view giving their honest opinion as a form of integrity.
2) Empty page blogger: This type of blogger also views himself/herself as an honest blogger, but follows a different approach. "If I don't like it, I don't write about it" is their philosophy. It can be an excellent way to avoid causing dissension. Also many bloggers are published authors or aspiring-to-be published authors, so they may know the pain caused by a negative review.
3) Its not my "cuppa" blogger: This type of reviewer might fall somewhere in the middle. His/her philosophy is that enjoyment of a book is highly subjective and dependent on many factors. I didn't enjoy this book, but don't let that hold you back.
I think sometimes the best approach is to fit in all three categories, dependent on the time and occasion.
Recently I published what I think of as my first "negative" review:
I strive to be honest in my reviews, but also kind in my words. Often I am an empty page blogger, however, when it strikes close to the heart I must become a brutally honest blogger.
I bring up a highly controversial subject...occasionally my integrity as a blogger demands it. We each have certain beliefs whether in our code of ethics, religion, or any other values that are central to us. I believe we each must decide what these issues are. Sometimes as bloggers I believe we can and should be confrontational...
But most of the time I believe we should be encouraging.
What about you? What is your blog review philosophy? Does it change dependent on the circumstances?