[themodelplumber]

That comes off as a hand wave, especially considering that it's a model / typology (if you understand the role of a model vs. a theory) and is still used in research. See also Dr. Dario Nardi's neuroscience work at UCLA.

[briandh]

A quick search of Dr. Nardi reveals that he has a financial interest in the MBTI, being the author and/or publisher of many "educational" works on type (see, e.g., here: http://www.radiancehouse.com/psych.htm ).

I did not see any peer reviewed journal articles by him on personality in a Google Scholar author search for his name, only books and a single conference paper.

Finally, looking at the most recent CV I saw -- http://www.darionardi.com/webcv.html -- only one of the papers in the "personality" section is actually from a journal, and it is, lo and behold, a Type-centric journal. And half of the conference papers are for the Association for Psychological Type International.

As appeals to authority go, he is a poor one.