I've only seen one episode of Survivorman.
In it, he landed on a beach (with an enormous pack on his back) that
just happened to have an old shack on it, which he patched up with some very new looking plywood that
just happened to have floated in on the tide. He then slept inside his repaired house with a big 'ole gun by his side and a hunk of whale blubber in his hand that his guide had apparently given him. I turned over at that point.
I was expecting something more along the lines of - "No food, no shelter, no water, just a knife and a whole lot of know-how."
The other episodes may well be better, but that one didn't seem very survivor-y to me