the director was critical of the way we were doing the work的意思是

您好，the director was critical of the way we were doing the work的意思是：負責人對於我們過去工作的方式很挑剔。這裏 be critical of 可以表示“具有批判性”和“挑剔的”兩種意思，這裏顯然用“挑剔的”這個意思更好。