People are judged on their career. Just because Tyson had a period after what people consider his prime where he underachieved, that does not mean he should be given credit for what could theoretically have happened. He was not an old man when he finished fighting, he was not wracked and ruined by serious injuries. At his height he was a fighting machine who lit up boxing but he could be beaten and people who on the one hand will acknowledge that Klitschko opponents are often already beaten men before entering the ring, frozen by fear like rabbits in headlights, refuse to see the same tell tale symptoms in many of Iron Mike's victims.