One could argue that the Zero was nothing special. It was a great design, but technically rather common. It was made so light it had some structural deficiencies. Same goes for most of the Japanese navy aircraft.
As to war dragged on, the technological inferiority increased. Two exceptions are the superb cannons they developed, better than the Germans or Americans had, and the power output of the Homare engine, again better than BMW got out of their 801s. Though very unreliable due to a lack of special alloys...
Kris