I think he has decent advice about getting out of serious debt but, ultimately, the most important thing with loans is being able to reliably make the payments even if there's drastic changes in your life. My biggest disagreement with his approach is that if you throw all your cash at a loan to try and pay it off faster then lose your source of income, that money is now unavailable to you to make your payments and you might default or be forced to liquidate things at an inopportune time.

All these guidelines about percentages and all that stuff are arbitrary lines in the sand based on what someone else thinks is important. One person might call kids an enormous waste of time, money, and energy, another might call them the most important thing in life. Different areas have drastically different income to housing ratios, as well as average commute times. Where I live now, my entire car payment, insurance, and mortgage is less than my rent was where I lived before.