John Sickels, a former Bill James staffer, does a review of the results from Oakland's "moneyball draft" in 2002 on his Minor Leagues blog. His conclusion "Overall, the Moneyball draft wasn't a giant success, but it wasn't a massive failure, either."
Oakland had nine choices in the top 100 that year and got three successful major league players out of that, Nick Swisher, Mark Teahan and Joe Blanton. By contrast, the Twins had three choices in the top 100 and ended up with Denard Span and Jesse Crain. What seems clear is that, despite the hype, Billy Beane was not on to something new in his approach to drafting. And that really is no surprise.