Presti did very well picking for the Thunder. Durant, Westbrook, Harden, Ibaka.....
Of course, OKC doesn't have the same standards and expectations of the Spurs... if that's what you mean.
My "bust" definition is in the context of a Spurs 1st round pick, if that isn't already obvious. The expectation of any Spurs 1st round draft pick to to contribute to winning a championship. Cojo, James Anderson, Mahinmi and Beno are all busts by this definition.
Definiton doesn't apply for coaches, or even players from other teams. Doesn't even apply for Spurs 2nd round picks.