I don't like the Meyers-Briggs aproach too much. It's usually ok to use for comparison with a generic Job profile, but when it comes to specific tasks inside a team, it just doesn't cut it.
Indeed. There are quite a few papers out there that point out a lot of flaws in the tests. They specifically dis-advise the use of these tests to employers, hiring new employees.
Also, wouldn't an online MBIT test be comparable in quality to an online IQ test? You know, kind of like the tests where everyone scores above average