So let us see the situation: Could have Germany won ww2 with the Nazis? No. They were too mad and had no idae of real fighting (Göring in BoB, Hitler in Russia, both in not using the Me 262 as fighter as early as possible,...).
Could Germany have won the war without Hitler and his gang, I mean Hitler died after declaring war? If he died in 1940 just after the defeat of France, he would be seen as German Napoleon, with his errors and murders, but so also Napoleon is seen in France still more as a hero than a despot. So it would happen with Hitler, since after the defeat of France even the German communists and Jews were supporting him (to a certain extent)! The racial policy would be abandoned fastly as well as the Nazis would have no longer the power for long as there was no real successor. Germany would have become a democracy relative fast again. And the war? Well France was away and Britain behind the Channel. Germany would have negotiated a peace with Britain and France (perhaps borders of 1914+ Austria+ Sudetenland and colonies back for peace and Czechia and Poland). And Stalin would have now the bad man alone in Europe.
If Hitler died in beginning of 1942, the Russian campaing couldbe won by the German army as they would most likely accept a peace with Russia (and of course Britain and USA very fast. However if they were unwilling with Russian aid (resources!) they would have to face a much greater army and Luftwaffe. They would have much more difficulties). This would last until Kursk, where Hitler made a crucial mistake.
After that a victory in the meaning of dictating the peace conditions was impossible. However a German defeat as in 1945 was not a must. This was not before end of 1944. With the Ardennes offensive and the attack to retake Budapest, the Germans lacked the forces they needed for a successful defensive campaign. With these troups and material, Germany could have pushed the Red Army on distance and also the west allies. So a kind of status quo ante in peace negotiations would be possibel until that point. Only without Hitler of course.
Adler