The Art of War has been criticized by some in Chinese history because this text advocated using spies and deception.
In this sense, it was considered dishonest, therefore contrary to Confucian morality.
Aside from the military tactics it describes, he Art of War is also interesting as a historical document of how war was conducted in ancient times.
For instance, it tells us about the rank of military officers, and an emphasis on infantry’s ability to move move fast and any direction, the use of spies, etc.