Pretty fair article.
I found this excerpt interesting:
"Lynn James, who writes the Mrs Moneypenny blog, argues that Fire is only realistic “if you have a big salary, low mortgage and no children”. And not everybody wants to spend their 20s being frugal. “At that age I wanted to travel the world, eat amazing food, go to concerts and experience life.” "
Bit of a sad view. You can travel the world quite cheaply. You can eat amazing food quite cheaply, as long as you're not doing it every week. You can experience life on a modest expense. In fact I would argue that for most people, it's not deliberate spending on nice things that hampers their frugality, but rather untrained spending on social obligations (eg buying that round at the pub when you don't want to spend that money), unhealthy addictions (cigarettes, gambling), or money leakage from unwise decisions (poor investments, getting a bad interest rate on a mortgage, getting a personal loan etc).
Meanwhile the Guardian comments are the usual wank-fest of people unwilling to believe that financial intelligence / personal responsibility has a role to play in our society.