Refs take a lot of criticism... but try and name the big fights of the last ~10 years or so that have truly been affected by the referee. The list won't be very long at all.

The fact that people keep bringing up Cortez is a joke. Mayweather didn't beat Ricky Hatton because of Joe Cortez, he beat Hatton because he's heads and shoulders above Hatton as a prizefighter.