The sport has clearly evolved, and thus the quality of fighting has improved, AT THE LOWER WEIGHTS. I think because in the 50's,60's,70's football and other sports weren't as prominent boxing was getting the cream of the crop talent wise. Now we don't see that talent in heavier weight divisions, I mean Roy Jones Jr moved up to LHW, but since him probably Chad Dawson has been the only athletic phenom who has risen to the top of the sport at 175 and above. Most of the athletic talent now lies in guys too small to play other sports like Mayweather, Gamboa, Pacquiao, Rigondeaux, most mexican fighters, etc.