Saddest results on this list:
480: Greg Oden
460: Andrew Bynum
It's so disappointing to see two players with so much promise end up at this point. Both sad results, but for different reasons.
Oden's case is just purely unfortunate. He well and truly could have been a top 5 center in this league had he been even remotely healthy, and that's a big deal in a league so lacking in pure centers. Instead, injuries have made him one of the most incapable players in the league. It's sad because everything I've seen indicates that he's a pretty good guy who really wanted to be good, but just never had the chance.
Bynum is a whole other story. Another player who could have been a top tier (top 2 even) center in the NBA, career ruined mostly by his horrible attitude. Yes he has injury issues, but poor decisions have led to him re-aggravating injuries that he otherwise may well have recovered from, and his horrible personality and Basketball IQ mean that even if he did stay healthy, he still probably would have struggled to find a long term spot on a team.
Same deal with guys like Penny Hardaway and Brandon Roy - both good guys with elite talent who could have had hall of fame careers, but all cut short by unfortunate injuries.
So sad.