The thing you have to understand about Dave Ramsey is that his target audience is people who have a really hard time managing money and have either:
A) Spent too much on college and now have too much debt, or
B) Spent too much on junk and now have too much debt.

It’s a one size fits all approach to getting and staying out of debt, and it actually works really well. We used it to pay off all our student loans in just a couple of years. The debt snowball method is not necessarily the most logical sequence of paying down loans, since you start with the smallest loan rather than the one with the highest interest rate. It’s meant to give you a psychological edge and keep you motivated to stick with it. It’s also designed to get rid of your bad debt first and your “good” debt last.

But yeah, his investing advice isn’t great. Find yourself a good financial planner for that.