Yes, she can be seen as bad in some comic storylines. She often has her own agenda and might act against the heroes.
In many comics, Agatha Harkness is portrayed as a morally ambiguous character. She may do things that are considered bad, but there could be underlying reasons for her actions that add depth to her character.
It depends on how you define 'bad'. Sometimes Agatha Harkness's actions are driven by her own interests and can conflict with the protagonists, but her motives can be complex. So, it's not a straightforward yes or no.