MacArthur seems to have done a pretty good job in Pacific Front (not to mention the early part of the Korean War, but that doesn't count
). The strategy of by-passing enemy strong points with the island-hopping campaign seems to have had a lasting effect on the way war is conducted.
From what I am reading now (book on the 10th Mtn. Division), German Field Marshal Albert Kesselring did a fairly good job of tying up the Allies in Italy with a lesser force. Though he did blunder in his chance to repel the Allied invasion at Salerno...