A lot of what he says is good common sense. Live within your means, keep looking for better paying jobs, if you have to finance a bunch of stuff then you can't actually afford it. His debt snowball makes sense from a psychological view point (but not mathematically). $500 a month for 40 years invested in the market at the index rate is $5 million. So a car payment (one of his best pieces of advice).
What he gets wrong, and it's bad advice, is 15 vs 30 year mortgage. You should take a 30 year and invest the difference. Don't pay your mortgage off early. You are robbing yourself of investment opportunity.
Credit Score. Yes you need one. It's a tough row to hoe if you don't and no you don't have go into debt to have a great one. Just a history of timely payments. I put someone on as a named user on my cards and in 60 days they were able to shop their car insurance and go from $179 a month to $85. They'd been driving for 20 years w/o incident, ticket, points. They just sucked at money matters and had a personal bankruptcy.
Credit Cards. If you're bad with money you'll be even worse with a CC. But I have three and put my Cell/Internet on one, Netflix on another, Grocery and Gas on a third and setup to auto-pay the statement balance every month. These are all expenses that I incur regardless. I just use them to my advantage.
I watched a few of his videos and understand I'm not his target audience but some people he's not helping out as much as he could.