The pseudoscientific cult that is OPS you mean? It was pseudoscientific drivel when it was DaveSuperPowers' pet project, it's still pseudoscientific drivel now.

If you want a 'scientific' approach to the MBTI, here

there was no support for the view that the MBTI measures truly dichotomous preferences or qualitatively distinct types; instead, the instrument measures four relatively independent dimensions. The interpretation of the Judging-Perceiving index was also called into question. The data suggest that Jung's theory is either incorrect or inadequately operationalized by the MBTI and cannot provide a sound basis for interpreting it. However, correlational analyses showed that the four MBTI indices did measure aspects of four of the five major dimensions of normal personality. The five-factor model provides an alternative basis for interpreting MBTI findings within a broader, more commonly shared conceptual framework.

(emphasis mine)

This isn't exactly the sort of support MBTI forumites are looking for, but I'm sure the company selling the test was quite pleased.