From Christopher Ash, Job: The Wisdom of the Cross (Crossway, 2014), 428–9:

Job’s friends have a theological scheme, a tidy system, well-swept, well-defined, and entirely satisfying to them. But they have no relationship with the God behind their formulas. There is no wonder, no awe, no longing, no yearning, and no prayer to meet and speak with and hear and see the God of their formulas. They are content with the rules of The System they have invented.

Now some of their statements considered on their own are correct. For example, in 5:13 Eliphaz says that God “catches the wise in their own craftiness”; the clever person will be called to account by God. That is true, and we have seen that Paul quotes Eliphaz with approval in 1 Corinthians 3:19.

But although the friends make some statements that are true, they do not as a whole speak rightly of God because they have no relationship with God, no seeking of God, and no longing for God. For them he is a dead doctrine and an abstract theory.