What gripes do you have with Mustachianism?

I’m refer­ring to Mr. Money Mus­tache’s blog and the philos­o­phy that he preaches there.

I tend to agree with what he says, and per­haps bor­der on be­ing a fan­boy. How­ever, I never re­ally stress tested these be­liefs, and dis­cussing gripes that oth­ers have with him seems like a good way of do­ing that.