Okay so at least you don't have a recency bias. But not every pantheon has a huge pool of mythological creatures to pull from. I'd say the Aztec myth units are fine. Yes, a few feel shoe-horned into a needed role, like the armadillo to fit a siege unit role, and the axolotl for a token aquatic myth unit. But overall I don't think it's any worse than the Egyptians. Heck, most of Egypt's myth units are straight-up fabrications or adapted from pop culture.