The problem is there has not been an objective discussion about WWI for many years if at all and public perceptions are primarily based on the work of the war poets and popular shows like Blackadder and almost by definition come from a leftist/pacifist point of view.
Many veterans, particularly pre-conscription volunteers, were emphatic that Owen, Sassoon, Brooke et al were not representative of them or their reasons for choosing to fight
As pointed out elsewhere, Blackadder is a sitcom but in the absence of any other point of reference most people would draw the conclusion that Haig, for instance, was an unfeeling monster condemning thousands to death without a second thought when in fact compared with overall commander of the BEF, Sir John French, and his counterpart in II Corps, Smith Dorrien, Haig is actually the better tactician with more concern for his troops.
Unfortunately the BEF was fully trained to fight their previous war; the same way we fought an offensive war in sub-artic conditions in the Falklands equipped for a defensive war temperate Northern Europe, so we employed Boer War tactics against modern weaponry. The Germans, French, Russians and Austrians displayed a similar lack of understanding and suffered accordingly.