An alternative, and perhaps interesting way of looking at this problem is perhaps to work backwards and think about the worst political leaders in WWII.
I am not a great fan of Petain, or Rydz Smigly. Strangely, perhaps, i would not put either Mussolini, or Hitler in the bottom of the list. I dont think much of Goring, and the japanese political assessment prior to PH was also pretty poor as well. I am not all that impressed by Chiang Kai Shek either.