I think the M-B is useful, but I only apply it in the area of communication styles. As an INTP engineer, I run into a lot of ISTJ engineers. ISTJ and INTP viewp

I think the M-B is useful, but I only apply it in the area of communication styles. As an INTP engineer, I run into a lot of ISTJ engineers. ISTJ and INTP viewpoints are markedly different in what information is considered critical, how and when to make decisions, and how they like information summarized. So I use M-B to help understand the audience I am writing for or presenting to. When I first encountered M-B it rescued a sour relationship with an ISTJ boss who thought I wrote content-free status reports, where I thought I wrote well-summarized round-ups that avoided meaningless minutia. Later, the table was reversed when I had an ISTJ report who drowned me in more details than I could (or needed to) process. I used M-B to help us workout guidelines for talking with each other so that we were productive instead of both frustrated. So M-B has been useful to me. But it should not be used for making hiring/placement decisions. I really see it as an information processing styles inventory and little more.