Yes, they can be loud. And not just at dawn, either.
Only one of my several roosters is obnoxious, but he's a banty rooster (Silver Sebright) so he's awfully small. And good looking. It's just funny that he tries to flog visitors. Well, some times he is successful, but I've warned 'em and they're familiar with his antics. He challenges me, but does not attack me because I have demonstrated I am dominant over him. (He is not the dominant rooster of the flock.)
"Beat up the hens" is really just over-mating, which wears off their back feathers and sometimes the feathers on the backs of their heads where the rooster grabs with his beak whilst exercising his rooster sties of fertilizing her eggs.
If you have plenty of hens, chances are they won't be damaged by over-making, as there will be lots of ladies for him to spend his energy. However, roosters sometimes have favorite hens they mate more than others.
Besides being handsome fellas (nice yard eye candy), roosters also settle squabbles between hens, provide a warning alert system when they see predators, find goodies for the ladies, greet the morning with loud announcements, and also provide fertilizer just like the hens, eat bugs like the hens, and can sometimes be brave enough to challenge predaors to save his girls.
Their interaction with the flock is SO interesting to watch!