'Sapiens' is a short telling of the entire human history, from pre-anatomically modern humans through the agricultural and scientific revolutions and to the present. Or so it attempts to be.
Unfortunately, this enormous task is the book's own undoing. There is no room for any indepth discussions about the various complex issues, and no room to discuss the evidence. The book is filled with assertion after assertion, and virtually nothing to back them up. I looked in the reference section and I was shocked to see how few citations there were. Such a massive subject derserves ten times more citations. If you think you're getting a good scientific description of the facts, don't buy this book. This book is essentially his opinions, and not much else.
Any person who has strong knowledge within any of the subjects in the book will quickly realise that Harari is not an expert on much of what he writes about. He does not just make many claims. He makes many wrong claims. And many, many more misleading ones. It's one of those books that are popular with the layman, but not so much with the expert.
When he leaves the topic of evolutionary biology, premodern history, and starts talking about modern history the book gets slighter better. Or is that just because I'm not as well-versed in those topics? Do I just not see his errors there, just like a layperson would not see his errors in his account of evolutionary biology, intelligence research, and more? I won't know. The problem is I can't put much trust in him, because there are so many things wrong or misleading stuff elsewhere. And he doesn't provide sufficient evidence.
Even in the better parts of the book, it is ultimately somewhat dull. Not much new to learn for me, unfortunately. There are so many books about humans, many of them much better than this.
I wouldn't claim that this is the worst book ever, obviously. But to say that it is overhyped is to put it mildly. If you want to read a story, then perhaps you might find it interesting. If you want a factual account that is supported by an honest look at the available evidence, then go somewhere else.