CO's are just like any other elder you'll run into. Some are very nice people who I think genuinely cared about the friends. I don't think they had any bad motives at all. One CO would come over for our family study. He was just tell my dad, "I think you got this" and take a nap in our living room.
On the other hand, I've known some real asshole CO's. You know, the ones who create circuit policies based on their opinions. When I was about 11 or 12, the current CO decided that Star Wars was a horrible thing from Satan. My dad made me get rid of all my SW merchandise. That was terrible. Once the guy was gone a couple years later, everyone forgot about it and it was cool again. This same CO's WIFE was even a jerk. She would regularly skip service to do personal errands or get her hair done or whatever. She'd even break appointments she made with the publishers for that stuff. Her excuse, and I quote, "I'm the CO's wife. I can do what I want." I am not making this up.
The last CO we had was a real tool. Literally every single talk he gave contained some sort of condemnation of 'social networking.' He was like a broken record. Then last year when "The Society" changed it's stance and said, 'well i guess it's not terrible if you don't post dick pictures' or whatever, he said in a talk, "We never said social networking was bad. Just don't misuse it." What a moron. It's like he expected people to forget his talks over the past 3 years.