You would be right. It took me a while but I began to notice that a high percentage of key hires in other areas of the business were notably failing to make the sort of contributions expected of them. They must all have done "well" on the psychometric test of course but was it possible that this was over influencing the selection process and eliminating better candidates - of course we could just have been attracting the wrong applicants.
My recruiting was able to balance any psychometric testing bias by only short listing people we thought were likely up to the job technically and who would fit in with the team. Other areas probably did not have the luxury of having the capacity to "test" that someone could probably do the job as well as pass the more dubious psychometric test.
After I left that company I was pretty sure that I would avoid businesses that used psychometric testing - in the same way as I would refuse to interview for any business that used something like graphology - more obviously bogus science?