It would have been usefull for propaganda aimed towards the children at first, then later the Hitler Youth specifically, but would it have the appeal that the US version did. While early US comics may have had racist and sexist depictions, that wasn't the main focus of the books. (Although looking back on allot of them, they were pretty harsh by our standards today.)
If Germany had developed this medium first. It would be so heavily geared toward war, racism, and aryan egoism it would have been really unpalatable to other nations for the most part. But as a propaganda instrument within Germany, and areas with a huge German population, it would have had similiar power as films and radio broadcasting at the time. If started approximately in the early years of the DAP it could have potentially influenced more young people to become openly racist and favor the party as they come of voting age.
Say Hitler with his art background started drawing a godlike figure while spying on the DAP. [This character is the last of the original Aryans, held in suspended animation as an infant in a bunker in the Artic, and found by a childless german explorer.] As he grows more active in the party he starts to publish this character (Supermann or Ubermann(?)) in pamphlet form, which ironically brings some income to the parties' coffers. Later on a youth group is formed - Superfreunde (OTL Hitler Youth).
In the long run though, while setting the stage a little earlier, I don't think it would have had any effect on how WW2 would have turned out. It may even destroy the possiblity for other nations developing this publishing medium as it is seen connected with nazis and the horrible things they did.