Let's see:
Kevin Durant and the '07 Texas team got upset in the 2nd round (while Greg Oden went to the championship game).
Tim Duncan (as a Senior) and the '97 Wake Forest team got upset in the 2nd round.
Shaquille O'Neal (as a Junior) and the '92 LSU team got beat in the 2nd round.
Michael Jordan (as a Junior) and the '84 UNC team got upset in the Sweet Sixteen.
But Pervis Ellison, Ed Pinckney, Keith Smart, Anderson Hunt, Bobby Hurley, Donald Williams, Ed O'Bannon, Miles Simon, Jeffrey Sheppard, Mateen Cleaves, Sean May, and Wayne Ellington all looked pretty darn good in the tourney.
Tourney performance probably isn't the greatest way to judge NBA potential.