I review books on this blog, and when I do that I also post my reviews on Goodreads and an Amazon because
posted reviews are helpful to authors (especially independent authors) even if you don't like their work.
So recently I posted a review here - and on Amazon - and my review clearly stated that my opinion was the opposite of many of the others I had seen to date. In fact, the book in question had over 2500 reviews already on Amazon and most of them don't like the book. I liked it.
Now I'm all for discussing different view points on books - even with strangers - and I often do with my friends. Some books they love and I don't. Some books I love and they don't. Some books we all love or hate.
I think (barring really poor writing skills) much of how we feel about a book depends on our life's experiences and where we are in our own lives at the time we read the book.
What happened when I posted my review on Amazon though, was something different altogether. I found it really odd that right after I posted my review - again on a book that already had over 2500 other reviews - I was almost immediately notified that someone had commented on my review. I'm a curious person so I checked it out. In retrospect I get the feeling this person may have been waiting for positive reviews to go up so they could pounce on them.
The commenter basically wrote three paragraphs explaining why my review was WRONG. Not saying she/he disagreed with me - which I would have been fine with - but actually telling me I was wrong in how I felt about this book and trying to convince me to change my mind.