Every once in a while in the NBA there's an exceptional player who comes along, totally sets the league on fire (or at least creates a spark) only to end up having something derail his career.
Whether it be an injury, an attitude or just a combination of bad decisions, some players end up more likely to burn out rather than flame on for a long, fulfilling career.
Recently, there are quite a few obvious examples of these kinds of players, Eddy Curry being one of the more recent.
Curry spent the early part of his career with Chicago and New York where he was offensively brilliant and at the very least a tall dude on defense. Various roadblocks (and cheeseburgers) came along, completely ending any hope for him to become a perennial All-Star.
He's just a small nibble of the big meal that is the collection of disappointing NBA players. The past decade has been ripe with guys who should have traveled through the league and done much better than they ultimately ended up doing.