When I ask this question I think about players who had a shitload of talent but never lived up to their potential for whatever reasons. My vote goes to Rasheed Wallace his versatility was unmatched he could shoot the 3 ( shot too much of them) he had a great post game, he had great defense, and...
http://www.nydailynews.com/gossip/2010/12/21/2010-12-21_jets_coach_rex_ryans_wife_michelle_bears_uncanny_resemblence_to_woman_in_footfet.html
"Dont throw stones if you live in a glass house".