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Don't know anything about he-man but the episode was greatly entertaining, and I like that they admit they were pretty much shooting darts at the wall.
From my perspective, and I could be wrong, but the property and characters had little to do with it's success. What really made the toys take off was the fact that they were huge, close to 6 inches when at the time star wars had made 3.75" popular, so the scaling was a great way to convey power.