There are people who believe Macarthur was a great general. I personally think he was the epitome of the pompous ass general officer.
Sitting in Australia wringing his hands, talking about how things should be done and botching most of his operations. His strength was the American officers and soldiers who served under him...they were the only ones who did anything of substance.
Just my opinion (and certainly not a slam on those who served in the Army in the Pacific Theatre)
Great military battles are won by leaders who have sufficient committment, strength of will, and self-confidence that they can get the troops to fight for them. Some degree of military prowess helps, too. Absence of jerk-dom and pomposity aren't included in the list of attributes.
Most of history's great military leaders were loud, rude, or pompous jerks, and many were masters of internal politics. Dugout Doug fit the mold.