Unlike the reviewer below I have read the entire book. Consequently I think I am in a better position to actually say something legitimate about the quality of 'What To Believe Now'.
'What To Believe Now' is a book about epistemology, otherwise known as 'theory of knowledge.' It is a book about applied epistemology, which is to say it discusses practical matters concerning beliefs. In particular it deals with subjects like conspiracy theories, expert testimony, wikipedia, blogs, and so on. The first chapter is the most theory laden part of the book and lays a general groundwork about what constitutes a belief. The rest of the book applies this theory to actual cases of belief formation and cases where what constitutes a right belief are called into question.
There are a number of excellent things about this book. The first excellent thing is that it is readable and engaging. It is the sort of book that one doesn't put down - it's like reading an addictive piece of fiction. In my experience this is highly irregular as far as philosophy books go: most philosophy books are dull and plodding. Not so for 'What To Believe Now' 'What To Believe Now' is a lively and readable piece of philosophy that happily contains a good dose of dry humour. In the same vein the book has the virtue of not being overlong. Some philosophy books are unnecessarily verbose and rambling - 'What To Believe Now' says what it has to say in an economical way and I cannot see how it could have been better said even if it had have had another 200 pages.
The second excellent thing about 'What To Believe Now' is the fact that it has some impact upon the sorts of beliefs we should hold, and therefore may have some impact on how we behave. For example, the book discusses what constitutes the right conditions for believing the testimony of others. It is easy to see how this discussion might contribute towards our day-to-day life. We are constantly being advised by people all the time and it is not always clear when and who we should believe. 'What To Believe Now' helps provide some grounds for guiding us through such issues. In this way, 'What To Believe Now' actually does a useful job in helping us decide what beliefs we should hold. This has other normative implications - once we know what beliefs to hold, this helps guide our actions. If we know we should reject the expertise of climate deniers then this will surely cause us to behave in different ways (we might petition the government more, use the car less, cycle to work more often, etc). To this extent 'What To Believe Now' has ethical implications and this is the case even if the book is ostensibly about epistemology. So the book is different from other philosophy books in another way: apart from actually being interesting it is also unusually pertinent and helpful in a way that other epistemology books are not. It is not solely about theory, it is also about action.
I highly recommend this book for anyone curious about what sorts of things we should believe in this age of information overload.