Aztec Mythology/YMMV

Magnificent Bastard: Tezcatlipoca, in spades.
Never Live It Down: The whole mythology tends to be overshadowed by the sacrifices.
Values Dissonance: Oh hells yes. None of the gods are really "good" or "evil," and while people from most other cultures are horrified at the vast number of bloody sacrifices the religion entailed, they were seen as absolutely necessary to the practitioners. For instance, the reason for the child sacrifices to Tlaloc? To make sure there'd be rain. Ripping out hearts? Make sure the sun keeps moving across the sky. People being flayed alive? Otherwise the corn won't grow and everyone will starve.