I, too, became an unwitting / unwilling rooster keeper, but now I am a convert.
A few things I experienced:
A teenage roo is a randy dude, and as another poster said, can terrorize your pullets. It's really ugly and violent in the beginning, and you'll find yourself wishing you could go back to the peaceful, pastoral flock of only a few weeks ago. So as another poster suggested, separating the dude until he (and pullets) gains maturity might be a kindness. Another idea is to have plenty of objects that provide easy escape routes for hens: lawn chairs, boxes, stumps, lots of roosts, etc. My hens have enough places to easily avoid my rooster's advances if they like. He now does the little dance and flirtatious overtures, rather than attack.
Sometimes, if you have no rooster, one hen will take over the role of missing rooster, protecting the flock, crowing, and NOT laying eggs. So if you lose the roo, you could just possibly lose a functional layer, too. This really happens.
After my rooster grew up and learned to behave like a gentleman, it seems like my hens like him and feel safer having him around. He is on the watch all the time and calls the hens over for first taste of treats. When I put him in my basement in winter to protect his comb during cold spells, the hens act bewildered.
My rooster is a handsome fellow, visually enjoyed by all who visit. Neighbors and I like the crowing, which is timely and not excessive.
Meanwhile, pity me. My last batch of female chicks turned up another roo. Good luck with yours.
