Barabra's origin has her as a literal avatar of a god. It can be Urzkartaga, it could be "huntress goddess" or whatever in the Nu52, or it can be an Egyptian god. Complaining that Cheetah losing to a fight against catwoman, green arrow, batman, or any other street level character doesn't mean that people want her dumbed down. Complaining that Cheetah gets treated unfairly constantly and gets underwhelming shows doesn't mean we don't want her to be smart.
Here's a concept, Barabra maintains her intellect and craftiness AND is ALSO a physical threat to Diana. It's a challenge, I know, having someone be really smart and really strong, but it is doable.