The ANZACS were brave and valiant soldiers. Anyone that has ever read about their heroics at Gallipoli will appreciate the extreme adversities under which they had to fight, and the sheer incompetence of the British high command that sent them there in the first place. Winston Churchill, who conceived of the plan, was literally run out of office (as 1st Lord of the Admiralty) because of the debacle and did not have any serious role in the British government again until he became Prime Minister in 1940, just as Hitler was launching his blitz.
The Dardenelles was his idea but the implementation left a lot to be desired. Either way he had to take the fall.