Of course, it doesn't stop there, does it? You're encouraged to have as many as possible, and they must give away enough of the plot to make it sounds mind-blowing without spoiling it for the potential reader. And of course, they must get close to five stars but not five stars because that seems suspicious, but anything under two and you may as well bury your head in the sand and perhaps, your writing career with it.
And book awards! If you won awards, then you've made it, baby!
Does this sound a tad intimidating?
This isn't to suggest that I don't enjoy having a great review thrown my way. I also wouldn't snub an award. However, much like the shameful act of not writing enough words a day, I believe this also fits under the same category of unnecessary stress that authors put on themselves.
Just write a great book. Don't fixate on the other stuff.
The truth is that having a lot of reviews give you a boost on Amazon, but most people will read your book because it captivates their attention and connects with them in some way. They're going to read your book because they checked out a free preview and found it interesting enough to continue. They're going to read your book because they saw you speaking in an interview or a video (see below) and liked what they heard. They're going to read your book cause they loved the cover or because a friend told them about it. They probably won't read your book only based on how many stars you got in a review.
I'm not an expert. I only know what's encouraged me to buy a book. It's never been because it won an award. I've also never relied on book reviews because savvy marketers offer services to write them. I also know that our tastes vary. A book I love might not be for you and vice versa.
It's not a race or even a competition. It's about finding your readers.