Was Nazi propaganda effective

Absolutely. Posters helped to recruit millions of Germans for the Wehrmacht (German Army), but most effective perhaps, was anti-semitic Propaganda. In this instance, I'll use the book Der Giftpilz.

Written by Julius Streicher in 1938, this short novel taught children - yes, young Germans - that Jews were dangerous by likening them to an attractive albeit deadly mushroom. One of the final chapters in the book even blamed them for the death of Jesus Christ (please see the Related Question below for more on that). Goebbels (Hitler's minister of Propaganda) commissioned Streicher to write the book so that the next generations of Germans would be as anti-semitic as their forefathers.