How would you rate your intelligence?

IQ is the best measure of intelligence we have with over a 100 years of enlightened research into the field.

IQ correlates with wealth, SAT scores, what kind of job you'll get, country GDP per capita, it inversely correlates with your chance of going to prison. Hell, the US army won't even take you if you have an IQ of less than 83 because you're essentially too stupid to efficiently do anything.

IQ absolutely, definitively is recognized as evidence of intelligence by numerous organisations and academics, and there is copious amounts of evidence showing that those with a higher IQ tend to more successful than those with a lower IQ across numerous fields.