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http://brankomi.wix.com/inequality
http://krugman.blogs.nytimes.com/2014/05/24/is-piketty-all-wrong/ The Krugman piece references other conversations about the FT takedown, but the general consensus seems to be most of the flaws are understandable given the datasets, though there is one class of flaws that need explanation. One other point to consider, unlike Rogoff & Reinhart, Piketty has made all the data and formulas he used, available online. R & R refused to release their formulas to the public. They did release them to the student who discovered there "errors." I think hubris did them in there.