Well, one thing is sure: this book is very well written. 
 Until the heroes were in the boat, I wanted to give the book 5 stars. The first part of the book was peeeerrfect: excellent timing for all the actions, great introduction of characters, great description of characters. They are all very interesting men, very different from each other, and the interaction between them is amazing. 
 But in the second part of the book, I felt like the "harmony" was gone. It was a bit boring (when it should have been the most exciting part). The fight scenes were missing something and I got bored with some very repetitive elements of the plot. The 4 heroes were great, but they were not given the opportunity to entertain the reader with interesting actions. Put simply, the plot did not live up to the characters. 
 Then end was also a bit disappointing. The ending chosen to allow for a sequel could have been better. It felt VERY forced, fabricated, I don't know how to explain. 
 However, I will rush to buy the sequel because I want to see more of those 4 men in hope that the plot will be better. I will also probably reread some great and funny passages I highlighted, most of them relate to the interaction between Rose and Flynn which is simply amazing! And not surprisingly, they are my fav characters in this book. Flynn does everything according to Hoyle, and Rose has no use for the Law, his own moral code being his compass. That makes for an interesting interaction. 
 All in all, I recommend reading this book because you don't want to miss meeting Flynn and Rose mostly, but Cage and Wash as well.