It's doesn't matter what the sport is, draft picks bust all the time. Whether their game doesn't translate to the professional level, injuries derail their career or they aren't given the opportunity, the list goes on and on.
Finally, we'll look at the 2000 Draft where the Blackhawks had picks 10 and 11. They selected Mikhail Yakubov and Pavel Vorobiev, respectively. Yakubov played in 40 games for Chicago and registered just 11 points. Vorobiev, a speedy winger, registered 25 points in 57 games. Both players returned to the KHL in 2005. Still on the board after these two were picked were Brooks Orpik, Steve Ott and Niklas Kronwall.
It's easy to look back now and see these were clearly the wrong selections for many reasons, but the truth is no one knows for sure who is going to produce or be a potential difference maker. Every organization has their share of busts.