The one year survival rate for people with metastatic melanoma that has invaded 2 additonal organs is only 13%, and the three year survival rate for metastatic melanoma is no more than 3%. It sounds like this is a treatment that holds promise for at least some patients, and certainly warrants further clinical trial. From the article to which Donuel linked, it doesn't sound like this procedure is being touted unrealistically as anything more or less than a result that suggests the procedure may hold promise for some patients.

My sister, who died soon after from a very aggressive metastatic breast cancer, participated in an experimental bone marrow transplant clinical trial a number of years ago. At that time, the procedure itself was still highly experimental. I don't remember the numbers, but do recall that the survival rate of the procedure itself was less than 50%. (I think it was around 30%, but can't say that with any certainty.) She nearly died from the effects of the transplant itself.   

Since that time, it has been established that bone marrow transplant is not an effective treatment for metastatic breast cancer, but has proved effective in the treatment of other cancers and other life-threatening disorders. It is still a very risky treatment alternative, but the over-all survival rate of the transplant procedure itself has increased to around 70%. This speaks for itself to the benefit pursuing the promise of experimental treatments.