Most Wonder Woman fans are happy with the idea of Wonder Woman being as fast as Superman. However, Cheetah should be faster than either of them, and none of the three should be as fast as a Flash or other speedsters.
Rucka set her up with a motivation that isn't too different from your second paragraph. She spent her life being passionate about archaeology and myth, and look where it got her. She wants to destroy the Olympians and the Amazons out of spite now. This a motivation that can lead to dire consequences in the DCU: if she succeeds in killing some Olympians, there are going to be pretty big repercussions. And her misguided hatred of the Amazons means her hate has placed Hippolyta and the rest in her crosshairs. She can easily be a threat or callously cause events that lead to a threat that endanger a city or the whole DCU.
I didn't read the issue, but it doesn't sound like anything in it makes any of the above undoable. Her conflict with Cale is interesting and needs to stick around, and Cale is after all just a mortal woman. It's not like it requires a great deal of effort or creativity on Cheetah's part to harm her. Hopefully we can get through this arc without anything TOO damaging, but honestly Robinson hasn't made anybody look good in this run.