We’ll we did underestimate Japanese capabilities in the beginning. Their torpedo technology was better in the beginning (Pearl Harbor and Savo Island) as examples. We caught up and passed them pretty quickly though
Their chrysanthemum stamped Arisaka rifles and later models were crap ; slow and noisy . We had Garrands and Thompsons .
Rations wise : meat & potatoes sustains better than rice and bugs
Then there was the Hellcat , the Corsair and the P-38s . Not to mention the P-51s and the B-29s
Nimitz Class carriers , Ohio Class battleships
All this said , the individual Japanese soldier was as vicious of a foe that America has ever fought . The Islamist of today are toilet paper by comparison . The Japs thought that their esprit de corps would be enough . It wasn’t