Patch's unorthodox appearance and mannerism can sometimes cause people to be uncomfortable. And physicians are generally a conservative lot (at least on the East Coast!). So, he is this tall man with long gray hair dyed funny colors (he had waist-length hair, one half was blue and one half was green, when I met him). He likes to touch people, to hug them, to be in contact with them when he is talking to them. He's idealistic and has done a LOT of good things around the world.
While I doubt his model of medicine will ever work in America (what do you mean I will only make enough to eat and sleep in a plywood house? I'm a doctor, for God's sake!), it is probably a model many of us concerned about humanism in medicine consider wonderful. He is one end of an extreme view and plan... and I think if US medicine meets him somewhere in the middle, it'll be a heck of an improvement to what we have now.
Anyway, I admire him for what he is and that he lives what he preaches. There's nothing fake or insane about the man. And it's actually been proven that behavioral state has a large impact on healing-- so to the person who said humor (clowning) has no healing effects, I think the literature would prove otherwise. Heck, visits by animals and music played by the bedside seems to improve healing time and general emotional well-being in patients. Nothing wrong with that, surely!
The movie is not one of Robin Williams' best, and not an accurate representation of Patch or most of the events in his life (no, she never got murdered by a mentally unstable patient in real life). It shows a lot of his clowning and compassion, but none of the things he emphasizes the most in his talks. And yep, they did kind of stiff him with the whole royalty thing but he just shrugs it off as Hollywood and goes on with his mission.