You don't see a problem with this? People need to know that some books are not worth buying to save wasting their money. They also need to know what the bad bits of books are, rather than just reading that, hey, everything is OK. To what do we compare your view with to work out what "good" means?
Let me give you an example. I ride a bike. I used to get a commercial magazine that would have cycling gear reviews. Bad products would be marked out as such. Now I don't get that magazine anymore but as a member of a cycling organization I get their in-house magazine. It too has gear reviews but as it is a large charitable organization they are trying hard not to be too negative, perhaps because to avoid upsetting a manufacturer. They feel they can take fewer risks than a commercial publication.
Whatever the reason, the reviews are useless. Bad point for a piece of gear are kind of papered over and a piece of gear that is only suitable for about 5 people is "OK for some". The biting criticism is missing. This means reviews lack teeth, or at least a reference point. When they review a cycle helmet they will say "this is a good product because it will protect your head". Er, great. And this is better at protecting my head than other helmets...why?
So some may ask "what style of writing does Ben Rothke find poor?" and we'll never know. Some may ask "so what layout of information in a book does Ben Rothke consider confusing?" and we'll never know. One thing is for sure I shan't be bothering to buy the books to find out because there's no incentive from reading these reviews.
You realize there are squillions of similar "hey make great content" books out there, right? How does this book fit in with those? Don't know? Then what does your review tell us when we're trying to choose the best one? Think about the cycle helmet example for a second.