I say it's disappointing because his blog really inspired me to make some changes and I agree with the overall thrust of what he's saying.
But the problem I have is figuring out how he accumulated his wealth. Of course, being a former physicist you'd think spelling that out in a simple spreadsheet would be a trivial problem for him. I haven't seen that though.
From what I have put together I think he got very lucky in the stock market, which quite honestly takes a bit of the wind out of his sails. Based on what he was earning, saving and investing, it seems that only outsized rates of return could explain his nest egg.
Nonetheless, his overarching theme is spot on.