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Gotta agree with the list and add my newest favorite the Fleischer Superman cartoons.
The rotoscoped animation is much more natural than anything I have seen in modern times, the shows are short, the art deco designs beautiful and they capture what makes Superman such an enduring character.
The only problem is as you hit the later ones there are nasty images of the Japanese (funny that, what did they ever do?), but again that can be a discussion point or parents can just skip them.