One of the better command decisions was to put McArthur in charge of more or less a backwater area of the war. Absolutely no offense meant to those people who fought bravely in the China/Burma/India theater, but Nimitz and the Central and Southern Pacific was where the Pacific war was won.
Eisenhower was a diplomat holding the European alliance together. He coulda/shoulda given more direct and clear orders to some of his subordinates but overall he was the glue that held everything together there and was absolutely the right man for the job.
McArthur in the ETO would probably have led to de Gaulle declaring war on America, or maybe both of them fighting a duel with pistols at 10 paces, with Montgomery waiting in the wings to take over as Supreme Commander.
