Macarthur as a coward IS a perception that many veterans in other Pacific areas might share. However, for a majority of veterans of the WWII USAFFE, Macarthur is viewed fondly. Everyone, of course, has his own take on Macarthur.

According to historical records, Macarthur received orders from Washington to leave Corregidor and organize US forces in Australia. It's recorded too that upon receipt of the orders, he threatened to resign and remain as private. For that reaction, I personally think it was his ego talking.

I believe a book (which I unfortunately cannot recall right now) about Macarthur and Truman during the Korean War reveals more about the character of the late general and could provide an insight on why he did the things he did when he was still in Corregidor.