well the bad part about OCD I think is that people like that are always bothered, because things are never going to be perfect. My obsessions don't revolve around things being perfect though.
My little sister's been to the mental hospital a few times for really bad OCD. She'd stand in the bathroom, naked (wouldn't wear clothes), washing her hands screaming and crying and having people turn the faucet off and on for her because she didn't want to touch it.
But my mom is abusive and the household is chaotic so I think that triggers it and negatively impacted her development.
I can't see anything good about OCD. Not when you really have it. In movies, shows and books they make it out like mental illness is a good thing, and that mentally ill people are smart (monk, a beautiful mind, girl interrupted). But in real life, I can't see anything good about it. I've been in mental hospitals myself and it is way romanticized. There is nothing cool or good about it, with the exceptions possibly of hypomanias that induce creativity and productivity.