I won't go into the details of how I read Joshua - in a word, critically - but I will say that I disagree with almost everything that WLC says in these 10 minutes. He ends up defending a view of God that has Him ordering the slaughter of children for the sake of a "greater good." In other words, WLC wants us to believe in a God who engages in child sacrifice. This is a line of interpretation that stems back to Calvin at least, and leads me to believe that something went badly wrong at some point in the church's hermeneutical history.
This lecture from David Bentley Hart (which has an intro that sounds like the theme tune to 'Everwood') goes some way towards explaining that history. If I remember correctly, DBH identifies nominalism - which portrays God as pure, unadulterated will - as the problem.