Received wisdom is the soma of the 21st century.
(Surely you remember "soma," the wonder drug in that novel you were supposed to read in 11th-grade English, Brave New World by Aldous Huxley? Soma had "...all the advantages of Christianity and alcohol; none of their defects," and when you took it, "...eyes shone, cheeks were flushed, the inner light of universal benevolence broke out on every face in happy, friendly smiles.")
We go to bed happier when we don't question assumptions. Of course I should buy the more expensive car. Of course Johnny Damon is about the safest fourth-round pick I could make. Heck, received wisdom often turns out correct, which explains why my tongue is still black from sticking it in that electric socket. But there are times (to bring this rollicking metaphor to a close) when we "experts" fall back on received wisdom far too easily when it comes to player evaluation. To wit: