You don't have to agree with everything he says, but most of what he says is very solid.
And if everyone followed his advice, the vast majority of the population would be better off.
Sure, he doesn't do "nuance." But let's face it - there's a good reason for that, because most people don't do well with nuance. Look at Dansdeals - we get lots of points, and as I'm a very small player, I can't even imagine how much money/value for experience people here have gotten from points. And I'm certain some of the members here are millionaires (though it's unlikely they became that way from their own credit card points).
But the average person using credit cards is getting smashed by credit card debt, and they struggle to get out of it. It takes over their financial life like an anchor, and doesn't let them move forward.
Let's take the point I probably disagree with the most - student debt. While I agree it should be avoided whenever possible, it's true that when necessary, it can be the best investment in yourself. However, not only do many people never graduate, there's also a large number that graduate with degrees that do not help them at all. And the point that people need to think and consider this, at least - that's important, and very underutlized.