Eh, psychology and psychiatry are still fairly young sciences. I'd say it's worth a shot, but people put too much faith in it. I've had family members in professional help forever with no noticeable improvements. They'll even admit to it.

My personal opinion is that, while sometimes useful, we just don't know enough about how humans work to really fix a large number of issues. People tend to go to psychiatrists persistently even after no track record of improvement out of the fear that they'll get worse. No one will ever recommend that anyone 'give up' on professional help out of the fear that saying so will make them responsible for the negative consequences.