I don't really consider guys like Oden busts. He would've been a beast if he didn't get hurt. Early 2009 season he was really coming into his own but his body just collapsed.
Anthony Bennett, Michael Beasley, Darko, Bargnani are probably the top 4. Darko has to be #1 easy. Pistons took him over Melo coming off a dominant NCAA tourney.
Tons of guys in the 5-10 range don't pan out. To be one of the biggest busts I think you have to be a top 3 pick.
Really, unlike the NFL you can name 8 busts a year per draft. In the NFL, you can get a great contributor at pick 9, in the NBA after about pick 5, you don't get crap and even in the top 5, usually every year there are 2 or 3 guys that never pan out