The index to David Lloyd George’s 1938 War Memoirs sums up his feelings about Field Marshal Douglas Haig:

his refusal to face unpleasant facts
his limited vision
Germans accustomed to his heavy-footed movements
his stubborn mind transfixed on Somme
his misconceptions concerning morale of German army
obsessed with Passchendaele and optimistic as to military outlook
none of his essential conditions for success prevail at Passchendaele
misrepresents French attitude
his plans strongly condemned by Foch
misleads Cabinet about Italian Front
prefers to gamble his hopes on men’s lives than to admit an error
completely ignorant of state of ground at Passchendaele
fails to appreciate the value of tanks
not anxious for success on Italian Front
a mere name to men in the trenches
narrowness of his outlook
incapable of changing his plans
his judgement on general situation warped by his immediate interests
his fanciful estimates of man-power
jealous of Foch
does not expect big German attack in 1918
distributes his reserves very unwisely
his conduct towards Fifth Army not strictly honourable
his unwise staff appointments
his defeatist memorandum of 25/3/18
unfairly removes Gough from command of Fifth Army
his complaints as to lack of men unjustified
does not envisage Americans being of use in 1918
stubbornness
unreliability of his judgments
launches successful attack of 8/8/18 […] but fails to follow it up
his censorious criticism of his associates
his attempt to shirk blame for March, 1918, defeat
only took part in one battle during War

Also: “unequal to his task”, “industrious but uninspired”, “did not inspire his men”, “entirely dependent on others for essential information”, “the two documents that prove his incapacity”, “unselfish but self-centred”, “his inability to judge men”, “liked his associates to be silent and gentlemanly”, “his contempt for Foch”, “his intrigues against Lord French and Kitchener”, “his failure at Loos”, “his ingenuity in shifting blame to other shoulders than his own”, “his shabby treatment of Gough”, and “his conspiracy to destroy General Reserve”. He found in Haig’s diaries “a sustained egoism which is almost a disease.”