When injuries derail your career and you're a guy who played well when healthy, you're not a bust. You're just a guy who had shitty luck.
That's fair, but he was still effectively a bust for Portland. They knew his injury history and decided to accept the risk of drafting him, and as it turns out, made the wrong choice.
Heck, if you really want to be fair, it's not Bennett's fault that the Cavaliers took him #1.
Those picks were both busts, for the GM/Team.