On one hand – art may be made popular/iconic by marketing (this has direct impact to our brains).
On second – still there are good and bad art. But one have to have knowledge to detect it.
The social scientists are right to say that we should be a little sceptical of greatness, and that we should always look in the next room. Great art and mediocrity can get confused, even by experts. But that’s why we need to see, and read, as much as we can. The more we’re exposed to the good and the bad, the better we are at telling the difference. The eclecticists have it.