Ron Paul assumed he is right about every issue and is unwilling to see the other point of view. He is unwilling to compromise on anything.
That makes him a piss-poor Congressman. Granted, pretty-much all of them are piss-poor, but at least they're open-minded for the most part.
He has also corrupted the minds of many regarding money and monetary policy which has or will hurt many people and muddles the conversation thanks to his stupidity.