Typical "those guys know nuthin and we got it all figured out" comment that seems all too common on Hacker News. Calling psychometric evaluations voodoo is akin to doubting climate change or casting a wary eye on vaccines. The evidence, methodological rigor, and results are there for all to see, but it just doesn't mesh with your gut feeling. Of all the things in the field of psychology to call voodoo, this is almost certainly the least deserving.

Like everything, competent implementation and use are key, so I'm sure you have had experiences that give you reasons to doubt their efficacy. But every field suffers from some form of that in some way or another, and the degree of transparency into the process varies greatly.