Wow, the ignorance.
National Socialists were formed in response (in part) over the fear of democratic liberalism as incorporated in the Weimar Republic. They were in direct opposition to the Social Democrats (what we envision as leftists in today's vernacular). The SD support came from liberal, progressive (at the time) values in democracy, trade unions and secularization. They were flanked on the left by Communists and on the right by several conservative parties. National Socialists arose through denouncing the Versailles Treaty, the forces that they viewed as the backstabbers of 1918 (who they viewed as leftist revolutionaries), Jews and Marxists (Communists and Soc. Democrats). Since the Weimar Republic was a weak democracy, the forces aligned against it were revolutionary (conservative primarily, though communists were also revolting against democracy).
Nazism evolved into a Nationalistic cause behind the leader principal. Rohm represented the Storm Abteilung (SA) who were street fighters and for ongoing revolution. They felt that the Nazi's win in 1933 was just another step in the revolution. The next step (since they had defeated democratic-i.e. center left politics) and established a one party state, was to eliminate all conservative and remnant liberal entities. Hitler denounced and defeated the Rohm faction solidifying his hold on the party becoming the soul and undisputed leader of the party.
Nazism was racist, nationalistic, authoritarian, militant and expansionistic. Anything beyond the most simple world view as espoused by Hitler was purely tactical in nature. During different times of Nazi power they used capitalism, corporatism and socialism to forward their agenda. For example, Hitler had and implemented a variety of schemes over taking over large estates, primarily he kept it as Jewish owned properties being Aryanized.
Nazism did incorporate many reactionary elements that would be tied to conservative values, thus the initial appeal to lower middle class citizens who were threatened by unions and modernity and the appeal to conservative sections of society. Hitler's initial difficulties with the right were not over ideology but that he was an outsider to the monarchist, feudal landed aristocracy of the Prussian class.
Hitler did incorporate many modern elements (at the time) to his policies, i.e. eugenics and a dose of breaking of class barriers. However, in no way would his policies or actions be considered leftist. He was against modern culture, he was against democracy, he was against minorities, he was militaristic. I.e. none of his policies could readily be identified with leftist, liberal thinking.
When the Nazis came to power, there was a leftist party (as we would interpret it today) in Germany. Social Democrats. SD supported unions, workers rights, women's rights, public welfare, unemployment insurance, democracy (i.e. parlitarianism). After communists the Social Democrats were Hitler's primary target. To argue otherwise is simple ignorance.