Why is Berto getting so much heat for holding?

[Rantcatrat]

I'm just curious why Berto gets so much heat for holding when I've seen Mayweather, Roy Jones, and especially Hopkins do it all the time in their fights. Even more recently Mosley against Mayorga and Margarito held quite a bit, especially against Antonio Margarito, why does Berto get so much more flack for it?

Hopkins gets heat for holding. It is one of the reasons I gave Calzaghe the win in their fight.

Holding is a tactic that makes sense to employ if the boxer is on shaky legs and at risk of being knocked down. However, it is very boring if used strategically like Hopkins uses it.

How are rounds scored again? What are the criteria?