I thought about my comment and also yours, you made think about why I wrote this.

I probably want other readers to remind that they should not blindly trust recommendations from HN.

Edit: If everyone agree's on something, new readers will more likely accept the fact that this book is worth buying, but if a few say the opposite, the reader has to evaluate before buying.

I once bought the book 'garry kasparov - how life imitates chess' because of HN reviews, It was probably the worst book I've ever read, full of obvious things.