I'm not usually one to go around quoting people to make my arguments for me, but if Thomas Sowell is taking swipes at it, and it is a reasonable concern he brings up, I think that says something signficant.
Except that it's been demonstrated that Ashkenazi, versus Sephardic Jews, are significantly above average intelligence, and have been for centuries.
The
LINK is an expansion of what Murray wrote in The Bell Curve.