He gave the revolutionary Dr. Sun Yat-sen's Kuomintang/Nationalists Party a bad name.
Hated by every patriotic Chinese and loved by those who fear China as a potential superpower and the selected few Taiwanese/Nationalist elites who Chiang allowed to get rich.
Chiang not only failed to protect the Chinese citizens against Japanese invasion, and stealing everything in the Chinese national treasury for himself he was
Many of his horrible war strategies allowed millions of Chinese peasants to die just to save his precious troop's lives.
A little know fact was that Chiang was not actually selected by Dr. Sun as his successor, but through some things his wife, Madame Chiang Kai-Shek, did and the lack of a better candidate Chiang was allowed to be the leader of the Nationalist Party.
Chiang's lies and deceits are sadly supported by the Americans, who only helped him due the fact that the Americans were great friends with Dr. Sun and they believed that anyone who is fighting communism should be helped by the Americans.
It is because of his cruelties, corruptions, and mismanagement, Mao Zedong was seen as a saint and worshipped by the Chinese in those days (1940's to 1960's).
It is ashamed that as communism's influence in China wanes he is being viewed as less and less of a villain.