Some companies make hiring or promotion decisions based on MBTI. Now what's fun?

I'd say that's fairly silly, though so are interviews and resumes if you get right down to it. Anyone who believes they can make solid hiring decision based on one conversation (except perhaps marketing-sales people for whom making a good first impression is part of the job) is naive at best. The same goes for looking at few sheets of paper, although at least the information there is more substantial. Still, I’d agree the Meyers-Briggs probably shouldn’t be used for those kinds of decisions.

For my money, though, Meyers-Briggs is useful, not for observing absolutes but for tendencies. And it’s just fun between “friends”.