The cartoon hits you with the fun cute stuff (martial arts magic! wacky creatures!) very early, and does a slow burn on the heavier stuff (genocide! moral dilemmas! corruption! redemption!) almost like they were trying to sneak it past the network censors.
The live action version hits you with the genocide right off the bat, like, look this is a grownup show we ain't fucking around, and I think that ironically lessens the impact.