Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Real disappointment

This book is a let-down. I have followed Jack Ryan's life through many of Clancy's books and this latest pales in comparison. It left many questions such as: 1) Why was it necessary for the villians to research into Clark - contributing to the exposure of the Russian agent? 2) Why was it necessary to keep the agent alive if the objective is near? 3) Why the need to use the method of delivery? Why was there only one delivery? Why wait until the end of the event? All said, the villians are made to be unrealistically stupid. And the ending is a real disappointment.