No doubt MacArthur experienced some spectacular debacles, such as his failure to prepare for the Japanese air raid on the Philippines on December 8, 1941, several hours after Pearl Harbor was bombed, but his "Island hopping" strategy was brilliant, as was his landing at Inchon in 1950.
And I can think of some far worse generals, such as Horatio Gates, who was routed at Camden in 1780, or William H. Winder, who lost the Battle of Bladensburg in 1814, after which the British occupied Washington, DC.
MacArthur was insubordinate to 3 president. Now that might sound cool, but in his case, it really was't.