I think Dave generally gives good advice. The debt snowball will work although its not what I would do. He's pretty funny with some of his one-liners too, and I love the "live like noone else so later you can live like noone else."
Things I don't like are:
1. 12% returns
2. His stubborn adherance to no credit cards. He acts like it is impossible to use them responsibly.
3. Saying it is good to have no credit score. This will hurt many people.
4. Doesn't recommend owning bonds.
5. And worst of all saying you can spend 8% of your nest egg per year in retirement.
This is terribly ignorant advice and there is really no excuse for such a high profile "guru". Many old people will go broke if they listen to this.
But I have yet to find a "guru" that I always agreed with.