Above: screenshot of the reviews I've received in the UK for Excuse me, where is the exit?In many cases, if the book is well written and in general liked, the person reviewing it had a bad day at work, was left by the partner, didn't have regular bowel movements, whatever their reason, they had to take it out on someone.
In some cases, if the book is mediocre to bad or unreadable, those opinions are valid and important to the potential new buyer. That's what they are there for, by the way, despite the common misconception of authors thinking they're for them and therefore demand constructive criticism. I argued on one of the threads to think about how one goes about it personally. When I hated a book back then, in the days when I wasn't an author, I would've told my friends, 'Man that was utter shite, bored me stiff. The main character is just not right in the head. Don't buy it.'
I wouldn't have told my friend what the author could've done better. Why? Because I didn't care; I was a reader, a consumer and when that particular book didn't do its job, I moved on to the next.
It's rather ridiculous to demand anything from a reader. He or she already bought the book and spend valuable time with it, so him or her writing down what he or she thought of it, is a bonus, not something they have to do. To argue back or complain about it, doesn't really work in the author's favour, I would think. I for one would steer clear of giving an opinion, even if asked.
I received my first 2-star review today and guess what? I grinned, partly because I feel complete as an author now and partly because I knew it's going to happen after my post on Amazon was deleted. It's probably just a payback review for daring to speak my mind.
Besides, a mix of reviews is a good thing. It's natural that not everyone loves your book; some didn't get it, some didn't like it and then there are those who are completely taken. So no reason to complain and in case you have more negative than positive reviews, then, well, then back to drawing board.
So, authors, chin up, the next one might be five stars and the sun will shine again.