Remember when Tyson said no one could challenge him with their 'primitive' skills? This is like that...Mayweather fights like an old-school fighter, not totally, but enough to be better than what passes for boxing today.
Punching when the other guy punches is something you don't see much now, when guys have 'high guards' and take turns.
To beat Mayweather you have to draw him out and make him lead.