At last, someone (Professor Michael Luca) has come out and said what we've always known: there is absolutely no difference in the quality and accuracy of a book review by an 'ordinary' reader on Amazon, and a professional book critic. Moreover (and we all knew this, as well) critics were more likely to praise a book when the author was well-known/a prizewinner/had garnered press-coverage/ was connected to some media outlet.
I am leery of reviews, whoever writes them, ever since Dark Side of Midnight was compared unfavourably on Amazon to a certain well-known children's writer in the same field. This happened so many times, that the words 'stitch-up' came to mind. I have also read reviews of books by writers whom I know share the same publisher/agent. Or where some personal spat is being used to exact revenge.
Charlotte Bronte was equally sceptical. She wrote in 1850, over the sisters' decision to adopt the pseudonyms Currer, Ellis and Acton Bell: 'We had the impression that authoresses are liable to be looked on with prejudice; we had noticed how critics sometimes used for their chastisement the weapon of 'personality' and for their reward, a flattery which is not true praise.'
Interestingly, when Wuthering Heights was first published in 1847, Ellis Bell was praised for the strength and passion of 'his' tale. As soon as it was revealed, however, that 'Ellis' was in fact 'Emily', the reviewer slated the book as being 'odious and abominably pagan'.
Nul points, that critic!