I look at it that these labels were probably evaluated over and over before the research got released and this stuff became widely used. I am definitely ESTJ/ISTJ and reading the description of the Myers-Briggs types is interesting. The *NFP's don't describe me.
Right, like reg said, when they use this to label you at work and HR/management makes it fairly public, then that's not cool. At the last firm I worked for, they did Emergenitcs profiling. There were 4 aspects: conceptual, social, analytical, structured. It's done so the 4 areas total 100%. A few of us got close to 25% on each of these, which is considered good. The head honcho and a widely disliked bitch in middle management got less than 5% and 5-10% on social, respectively. Oh yeah, people posted these on their doors or at the entrance to their cubicles. One guy with a 67% conceptual worked for me (he talked like a stoner, good material for imitations)...and he was worthless ... too 'effin conceptual to do the detailed work that was assigned to him. But to avoid getting him in trouble, I took back his incomplete work and completed it.
The less than 5% prick that ran the place was Machiavellian to the point of diminishing returns. All of his most talented workers eventually left the firm. Not only that, he was self-righteous about his involvement in his parish and how many kids he had. So, yes, for this motley crew, the Emergentics profiling seemed to work. And the Myers-Briggs we are talking about probably works as well. Also, these are mostly used for career exploration in school/college...they shouldn't be doing these at work on people they've already hired, IMO.