They're not worthless but I guess it depends on what you're rmtrying to measure. Treating the result as a measure of innate ability that can't change is wrong I think.
A lot of it is a function of how much time a person has been trained in certain kind of abstract reasoning, which for the majority is a proxy for how much (not completely dysfunctional) education have you received.
(Not talking about super high IQ scores, just 'this person is normally intelligent' scores)

