I've seen it used to help people off heroin or other pain killers, but alternatively I've seen it used to provide them easy access to a new addiction.
What isn't though? This could be said equally for most pain medicines. Percocets, are they a good pain killer for people who are injured, yes. But if used way too much can become very addictive and damaging, yes.
Dust off, can it be a great way to clean out your keyboard or computer? yes. Can it also be used as an inhalant and get people high. Yes.
I mean it's not the drug or cause itself, it's the person using it. As a country we like to believe that more people are using methadone for good reasons than those who are using it for bad.