Well, this is MMA... boxing, kicking, wrestling, jiujitsu
Leaving aside his steroids use, he was very good because he had all these + chin + cardio + fight IQ.
Sure, his boxing is not that great and let's say Smith beats him in a boxing match... but again, this is MMA.
GSP losses to Condit or Wboy in a boxing match too... what does this mean?
Silva losses to many in a wrestling match... does it make him less great?
I don't think we have seen a fighter who is the best wrestler in his division, the best striker in his division and the best bjj guy in his division...