I do read book blogger reviews. I have my favorite bloggers and I trust them to give me good recommendations. I also read the reviews on Goodreads and Visual Bookshelf but those are more for fun. And I tend to read those after I've read a book and am posting my own review--more out of curiosity to see if others agreed with my opinion.
I don't read "official" or "professional" reviews. I find that I get better recommendations from fellow bloggers whose tastes and opinions I know and trust or from friends. Also, most of the books reviewed by "professionals" are current books and I'm not much for reading current books. Books that have been published 2000+ make up less than 30% of my average reading each month.