Unfortunately, chicken mating isn't very "nice". The males will chase the females around, grab head and neck feathers, pull them out, ride around on top while the female is trying to get away, chase the girls for no reason and making them squawk etc... as long as they aren't relentlessly tormenting, chasing, or drawing blood I wouldn't interfere. ALSO how many roosters you have per hens will determine how much they get "beat up"; more roosters= more beating up.
Renee, from everything you posted it doesn't sound out of the ordinary. While they are young and hormonal (and also working their way to the top of the dominance ladder) it is pretty much always like this. They may become better as they get older, BUT NOT ALWAYS. Give him a couple months (or more) to see if he mellows out if you want to keep him. Some roosters are born "nicer" than others.
AND generally, how rough they are with the other chickens is NOT an indicator of how they will act towards humans. "Unfriendly" cockerels are better in my opinion because they STAY afraid of humans, whereas ones that were coddled a lot as babies tend to NOT be afraid and have a tendency to want to challenge you more. The first signs of challenging are; not backing away when you walk close, staring you down, dropping one wing, dancing, walking purposefully TOWARDS you, etc. Not putting them in their place when those warning signs happen can lead to MORE challenging and eventually attacking/ flogging.
Hope this helps you guys!