Listen to his podcast episodes. It’s a quick way to get a feel for his advice and to hear how real people who call in benefit from it. Go back to 2020 or so before his co-hosts started taking more airtime.
He catches a lot of flak because the debt snowball that he advocates is mathematically inefficient (folks prefer to pay debts with the highest interest rates off first). Also his political views. Look past those things - there is so much valuable advice.
20+ years ago, he was one of a handful of well-known faces of personal finance, was nationally syndicated, books, etc. There were fewer outlets and fewer options than there are today.
His focus on debt and changing mindset around that will help some people, but if he's a turnoff (for whatever reason), you'll get 99% the same advice on most issues from dozens/hundreds of other personalities.
He strongly advocates against taking debt to buy real estate. He only recommends purchasing real estate in cash.
The recommendation to get a second job only applies as people are getting out of debt (baby steps 1 and 2). After that he doesn’t really recommend it.