Based around the concept of thin-slicing, this book promotes the idea that your initial thoughts / gut feeling are often the right way to proceed (but not always). There are many case studies to hammer in the point and look at it from different perspectives. I feel the concept was a bit oversold, confused, and not pulled together nicely at the end.
In terms of the fundamental concept that we can learn to make better and faster decisions when we filter out excess data, I agree. This particularly holds if you are experienced in the field (i.e. with experience comes intuition).
As for the "Compelling", "Astonishing" and "Brilliant" words being used to describe this book, I think that maybe "Thought Provoking with Interesting Stories" might be a better way to describe it.