Its not about the quality of the opponent though, neither Tyson or Hamed beat many really quality opponents during their prime but the way they did it, you could just tell they were a level above. Unfortunately it was only later after they had started to fall off that they began to fight truly great fighters and because they lost to some of those guys people act like their prime was overrated, that the reason they looked so amazing was because they were feasting on less than elite fighters, which just isn't the case.