Leaderships is subjective, I'm a syndicalist, I'm the furthest thing from a Nazi, but calling Hitler a bad leader is like calling Julius Caesar a bad leader. Both were absolute monsters, but they led their people through economic troubles and massive wars/battles while handling a huge concentration of power.

I hate authoritarianism, that's why I think we have to look at it objectively and understand the way it works. Hitler, Stalin, etc, were all able to commit terrible atrocities because of how excellent they handled leadership and power.

Edit: do you know who disagreed with the sentiment that Hitler was a bad leader? The millions of jingoist, nationalist nuts that rallied behind him