there are some really nice roos... alot has to do with the breed but also with a persons disposition around them. I have a RIR (which can be agressive) who used to attack me all the time. He never went after anyone else, just me. He quit after i cracked him in the head a few times with the feed bucket.
Anyway... I have 5 roos freeranging on my yard and he is the only one that has ever tried to get agressive. (2 RIR, 2 Brahma, and 1 SLW)