The fact that Kara was, at the time, kind of more evil than Cass was, does kind of make anything EvilCass does look good in comparision, amusingly.
What with her routinely beating up other superheroes in each new issue to show how awesome she was, selling Kandor to two dictators for information about her parents, threatening to break Power-Girl's arms when she tried to stop her, treating her semi-boyfriend like a pet dog, getting annoyed when people ask her to do actual superheroism...