Full god, actually. In Neron's weight class, certainly.
If I felt like acknowledging this bit of idiocy at all, I'd say that's not Circe, it's another echo like the illusion that fought Diana over Themyscira. Sort of the Doom-bot phenomenon. And Neron didn't care or expose her because her presence and agreement to the 'deal' gave him credibility with the other bargainers.