Sam Spade was really awful. He liked to play Nostradamus, making posts that were so vague that they could mean anything in an attempt to prove that he knew things after they happened. The one time he was explicit was predicting the Dow would hit 3,000 during the financial crisis. And he always thought calling people "f****t" was the height of wit. Truly terrible in every conceivable way.
But he did predict the Euro crisis- he said in early 2009 that Europe had it worse than America. He also said that Germany would be fine, however. In November 2009, he correctly predicted that the "Dubai crash" was a tempest in a teapot while the Greek budgeting revelations were big news.
He was wrong about Keynesian economics, but not the Euro.