What Were the Most Important Weaknesses of the Weimar Constitution?

In my opinion there are two major weaknesses in the Weimar Constitution - firstly, the context for its creation and, secondly, the P.R. voting system...
The Weimar constitution was created by Wilhelm the Second. He created the constitution and the democratic government as an alibi; he saw the impeding defeat and decided on trying to create a scapegoat that could take the blame for the war and everything that went with it. For the past several years he had tried, time and time again, to persuade the German public to put up with more and more day-to-day hardships always saying that it was for the all for the good of the war effort and that Germany was easily on course to winning the war.…