I read the post in question.
I've read the author's posts before. I don't recall anything way off the mark, but I also haven't read that site in the last year or more, so who knows.
I don't think it was BAD. For the majority of people, it's relatively sane advice. I didn't read anywhere where it said you must BUY BUY BUY whether you need the item or not. In fact, it said to make a list of items you need, and check prices. Well, sounds like good advice regardless of your frugal level.
"I want a brand new car, should I pay $40k or $30k for the exact same thing?"
"Well, that washer needs to be replaced soon, I'll keep an eye out for a replacement, be it a good deal at Sears or an awesome deal on a barely used model on Craigslist."
Yeah, at one point the blog had a different audience. Now it's mainstream. You're seeing advice that's good for the majority of consumers. The sad thing is the fact the blog used to be more about getting people out of the mainstream. Ah well.
I do wonder which site I'll latch onto next. First The Simple Dollar, then Get Rich Slowly, now Mr. Money Mustache. On the one hand, it's sad to think that MMM may/will devolve the same way the other sites did...on the other hand, it's exciting to think there'll be another site that's even more awesome, that I can learn even more from.