FDR, Churchill and their military staffs were not impressed either. But then again, one has to understand Chaing’s strategy, and it was what you would expect from a Chinese leader.
Chaing was not going to defeat the Japanese and eject them from his country. We were going to do that for him. And we were also going to pay him tribute in the form of money and war material. He was not going to use any of it against Japan, and had no intention of doing so. He was going to hoard it to settle accounts with the Communists after we had rid China of the Japanese for him. Although I sometimes wonder if Chaing ever really intended to destroy Mao. He needed Mao as a boogeyman to keep Uncle Sugar’s tribute flowing.
Or so he thought.
The fact is the Chinese Army was too ineffective to defeat the Japanese. As I understand it the main offensive plan was to have US B-29's bomb Japan into submission. But once we had the Marianas bases they were much more advantageous than the Chinese bases. The Allies were not able to open a major Chinese port for supply before the end of the war.
Chaing might have been able to pull it off, but neither he nor the US anticipated the boost the Red Army would give the Communists by turning over land and equipment seized from the Japanese in Manchuria during the last days of the war. As planned in the Teheran Conference.