I'm sorry I totally disagree with you. MacArthur was very average and over-rated, an egomania mommy's boy.
As Chief of Staff in the early 1930s he resisted efforts to motorise the US army, resulting in a severe lack of tank development and, more importantly, armoured warfare doctrine in the US military. This led to US tanks being hugely out-gunned by their German counterparts a decade later. in his defence, the military was bing run on a shoestring at the time.
In 1941-2 he was utterly defeated by a far smaller Japanese force in the Philippines, despite having plenty of knowledge they were coming. he shipped out to Australia where he harassed Australian commanders who were winning the first landf battlesd against the Japanese at Milne Bay, constantly attacking them for being 'too slow' when in fact their methodical approach worked very well. At this time he was prone at accepting the word of US reconaissance pilots over and above Australian commanders on the spot. He later forced the removal of successful Australian commanders in New Guinea. He made very poor use of intelligence generally.
He was obsessed with recaptuing the Philippines and avenging his defeat, to the detriment of the overall US campaign against Japan. He had the man (General Homma) who defeated him in 1942 executed on trumped up charges after a kangaroo court. He ensured the Japanese emperor never faced up to what he did, producing Japan's 'we did nothing wrong' attitude to the war that we see today.
In Korea he totally misunderstood the nature of his 'limited war' task, needlessly and foolishly provoking China into the war and precipitating a huge UN defeat and prolonged war. He tried to subvert the president ignoring the important democractic principle of the military being subordinate to the government- all out of ego.
He never defeated an enemy without massive air and naval superiority and overwhelmingly superior forces. He was a bit dumb.
His actions in New Guinea and Korea show he had only limited understanding of other people. His supposed insight into 'the asian mind' was based on his living like an emperor on 1930s Philippines, and was a bit of a fraud.