Versailles was, without question, disastrous. All parties failed. Wilson was too obsessed with the League of Nations. He was also not capable of competing, intellectually, with the European leaders. It's a problem American politicians, with the possible exception of Clinton, seem to always have. Lloyd George played two roles: (1) of the man who didn't care, and (2) the politician, pandering to the public.
Full disclosure: I'm not a big fan of Wilson, especially not as a person. He was a racist pig and, even before the stroke, not at all bright, especially for someone from Princeton. Conservatives want live babies so they can raise them to be dead soldiers. - George Carlin
It's something economists don't like to discuss, but Hitler was actually the first leader of a major world power to put Keynesian economics into action, successfully.