Not all medical science for sure. When it comes to cancer and CHD, YES. Of course not all is rubbish, but 99% of it could be (like in any other industry, there are only handful of real professionals).Open, yes.
Did he shun established medical science altogether? No.
Do you shun all established medical science altogether in favor of 'alternative medicine'? It seems so.
I think most rational beings will agree western science is so subdivided it has lost sight of the holistic way the body works. That does not mean the sub-divisions aren't VERY good at what each specializes in.
Real alternative medicine is to take all the separate and not so coordinated parts of modern medicine and unite them into a whole body theory. Not to dismiss known science for quackery. And yes, within known science there are errors, and yes within quackery there are truths, but the signal to noise ratio in modern medical science is much, much, much, almost infinitely greater.
If you look at this link it shows that cancer therapies are employed even when there is no sense in doing it (high costs, very low success rate, negative impact on lifestyle).
Here Industry Funding Changes Study Results, Research Shows | ucsf.edu is overview of study [http://www.ncbi.nlm.nih.gov/pubmed/23235689] that shows sponsorship of studies have impact on results.
And in my opinion this is only tip of the iceberg. In his book

Davin H. Newman, M.D. gives us insider look on modern medicine and how actually it works. It's all frightening to say the least.
Integrative Medicine. Now this sounds great but I don't buy it, no when it comes from mouth of people who sell chemo etc.
On the other hand like, as you have noticed, there are really crazy fuckers among alternative medicine practitioners, and they should be wasted in a hurry.
Sill, it's money money what is driving modern medicine, being profitable is always priority.
My message is, don't trust your GP (you will get this message from Newman's book and another great one "Beyond the 120 Year Diet: How to Double Your Vital Years" from Roy Walford M.D.).