There are hundreds of books published each month so it is impossible for all of them to be reviewed by a reputable critic. All authors like their book reviewed but only extracts from the favourable ones get used on the jacket. There is no doubt that good reviews are good for publicity but it is questionable whether the reader takes much notice of them.
Peatmore Press took great trouble to find reviewers for its first published book, Cogrill’s Mill but it was considered doubtful whether buyers took any notice of these when extracts were printed on the jacket or its website as the reviewers were hardly recognised household names.
http://peatmore.com/cogrills.htm
Most reviewers at that time expected payment especially if it was required by a specific publication date. So when successive books were published the Company went ahead and launched them without any glowing tributes to accompany them preferring to rely on word of mouth to help.
After all, it is not what is printed on the jacket or even the beginning of the story or the ending written specifically to grab the readers’ attention that matters; it is the bit in the middle which counts.