The diaries have become famous mostly because of the frequent remarks on and criticisms of Churchill. Although the diaries contain passages expressing admiration of Churchill, they also served as a vent for Brooke's frustration with working with the Prime Minister. The diaries also give sharp opinions on several of the top Allied leaders. The American generals Eisenhower and Marshall, for example, are described as poor strategists and Field Marshal Sir Harold Alexander as unintelligent. Among the few individuals of whom Brooke seems to have kept consistently positive opinions, from a military standpoint, were General of the Army Douglas MacArthur, Field Marshal Sir John Dill, and Joseph Stalin. Brooke admired Stalin for his quick brain and grasp of military strategy. Otherwise he had no illusions about the man, describing Stalin thus: "He has got an unpleasantly cold, crafty, dead face, and whenever I look at him I can imagine his sending off people to their doom without ever turning a hair."