Well in her defense the Myers Briggs is tarot cards for people with LinkedIn profiles. There’s not a bit of scientific validity behind it. It’s an entertainment experience not a psychometrically valid diagnostic instrument.
However, saying that the Myers-Briggs is the worst personality test available is a little bit like saying the Holocaust was the worst genocide ever. It's true, but that doesn't mean that the others were good.
In general, personality psychometrics is a pretty difficult field to work in. We don't have another source of data for personality, and as such, it's difficult to measure constructs appropriately.
Additionally, modern psychometric methods like IRT work best for tests where the answer is known, and so without another source of evidence, personality psychometrics is a very difficult field.
Finally, the "supported" model in psychology, the Five Factor Model is potentially not robust. The issue is that the authors refuse to use confirmatory factor analysis on their model, and invent new methods (procrustean rotation) to justify their particular choice of constructs.
When these analyses were done by others and suggested that their model was incorrect, they huffed and puffed their way through the ensuing academic catfight in the journals.
tl;dr myers briggs bad, nothing else is much better.