I have a black australorp roo, and so far so good. He is a good rooster, kind and gentle to the ladies, but keeps his eyes on the skies for hawks, and sounds the alarm when he needs too. he is still pretty young, and my lead hen helps keep things in order too. She is his senior, and she sometimes steps on his toes so to speak, but he doesnt mind. And he is human-friendly, hand raised and fairly nice. But hes been informed that I am THE ALPHA not him. He is not willing to walk up to me and he wont eat if I am looking - this is good! I can pick him up if I want and he does not fuss, although he is not necessarily a fan-this is also good. Heres a link to a thread that I think you should read. its a similar question, and explains the role of the roo. Protection is not their main gig. Remember, the rooster usually sees the threat before the hens, and takes off running. When he goes running, they do too. He's not gonna stick around to fight a bear or a coyote or usually even a dog or coon (and die) but he will get the girls moving and alert them to all kinds of things including food, treats, and predators while theyre out free ranging. Also heres a link to rooster behavior and flock structure.
http://shilala.homestead.com/roosters.html - rooster sanity
https://www.backyardchickens.com/forum/viewtopic.php?id=314174&p=1 - thread about rooster breeds/good roosters to have
I personally believe, after having "bad" roosters and FINALLY getting a good one (thanks to BYC and especially that rooster sanity info) there are some breeds that are known to be docile as opposed to others. And while this no doubt factors into their ultimate behavior, I think the breeds reputation is 25% of their attitude. We'll give 5% to genetics (were his parents "nice?") and the other 70% is all YOU. Handle your roosters several times a day as chicks, and keep handling them as adults. Let them know you are the boss and you can have your way with him, but you wont hurt him or the girls, and NEVER back down to a roo, because if you give him an inch, he will take a mile, and maybe your eye too. remember, he is not your friend, he is not your pet, he is not in love with you. his goal in life is to be the alpha roo, be dominant, and get all the attn and lovin from the ladies. He doesnt want to share. So you gotta instill in him from day 1 YOU are boss, YOU are dominant, and YOU win, 100% of the time. I am not suggesting you hurt him, beat him, or injure him. I am suggesting the wonders a gentle boot in the butt or a swat from a straw broom can be if he ever decided to challenge your authority (and he likely will)
Dont get me wrong, I enjoy having a rooster in the flock. I like to watch him talk to his girls, take them out to dinner, and coax them to bed. Its amusing to me. Chickens have a social structure, and if youre observant, you will see it. They argue, they share, they sometimes fight, they squabble over who gets to sleep where, and who gets to eat first, they look out for each other and if one runs, they all run, whether its in fear of a predator or excitement over a bunch of strawberry tops. Having a rooster is cool, but only if youre willing to put some work into him, or having a rooster can be hell. especially if hes mean and chases you