OCD is never useful. OCD is not a matter of being focused on a task or having an exemplary work ethic or being detail-oriented. OCD means taking something (whatever it may be) to such an extreme that it renders you dysfunctional.
I think there is a big misunderstanding about OCD that many people have that it is about being neat or organized or focused. A more accurate image of a person with OCD is someone who can't go to work anymore because they spend several hours per day standing under a scalding hot shower scrubbing their skin off, and crying because they don't want to be doing this but they have to or else the worst thing in the world will happen.
I think I will write a post on this subject since it is something I know much too much about.