Psychiatry certainly has scientific aspects to it. Cognitive psychology is definitely a biologically-based science, rather than the sort of Jungian/Freudian pseudo-religion that makes up most of psychology. And as I pointed out, we have a pretty good idea what Ritalian does to most people - pharmacology is a medical discipline, not a philosophical one.
But the bulk of secular counseling has absolutely no more scientific basis than visiting your local clergyman or holding onto some tin cans like a Scientologist. Indeed, most everyone who visits a psychologist could save themselves a lot of money by just availing themselves of the free service of the local clergy - you get the same basic deal, but at a sharply reduced rate.
As to Scientology's abuses, my suspicion is that it is a bit overblown by the media in the same manner that the Catholic pedophilia scandal is. You are actually at less risk of being molested by a member of a Catholic clergy than you are a secular teacher at your school - but the conventional wisdom paints schoolteachers as wonderful and Catholic clergy as a bit creepy. The same could be said for Scientology. Anecdotes of abuse do not indicate a widespread pattern of abuse - and it appears that the bulk of Scientologists are perfectly content being Scientologists.
The objection to Scientology over these other forms of mysticism seems to be that Scientology is awfully damn weird, while we've come to terms with transubstantiation and the super-ego as cultural norms. But ask yourself this: is a prohibition against psychiatry better or worse than a prohibition against modern technology (the Amish) or medical care (Jehovah's Witnesses)? All forms of absurdity may not be equal, but if we're examining the consequences of absurdity, the Scientologists really shouldn't be our top concern.
If Madonna can believe in Jewish numerology, then I see no reason why Tom Cruise can't believe 50s pulp science fiction is reality - they're entertainment stars, not intellectuals. I'm more concerned that Lindsey Lohan seems to believe that casual sex and drug abuse is the route to a happy and successful life.