Macarthur is not perfect but I have to disagree when you say "one is hard pressed to find many positive accomplishments."
First off (though this is not World War II) is the Inchon landing. Almost to a man, ranking officers told Macarthur that such an amphibious operation is not feasible and cited many practical reasons. Macarthur said that those very reasons mean that the North Koreans would also not consider that the UN would attempt a landing in Inchon. The operation was carried out and Macarthur was right.
Buna: It was a bloody and gruesome fight, many casualties. It taught Macarthur a lesson and from that developed the island hopping strategy.
Correct me if I am wrong but I do remember reading some years ago that after Buna Macarthur had the least casualty ratio among major US commanders.
I don't know about you guys but in the Philippines, Macarthur is generally viewed in a very positive manner, despite what happened in Clark Field, Bataan and Corregidor.

That's enough for me about Macarthur because this is, of course, a Pearl Harbor thread.