I'm going to write a big about her, here we go!
I am conflicted about her because I like her but I am pretty sure it is because she is sexy. I don;t think there i anything else about her that stands out. She was created as a derivative superman, but a Woman! how about that!
As time went on, as a joke, her chest got bigger. Since she had no other real characteristic readers could connect with, her chest took center stage. So for this reason, I feel like everytime she appears they try to compensate for it in some way. The o'Connor PowerGirl run is beloved, i liked it too, but I felt like it was so easy. She's busty, smart, runs a company, is a good friend, a decent person and bullets bounce off of her. She's too perfect and I think it's because we want her to be. She suffers from the same problem I think Harley suffers from, where Harley can't really be a villain, every boy wants to save her, so she ends up being very unrealistic and forced. I don't know if there is a way to fix that or if it should even be fixed, but I just can't take her seriously written that way. They might as well make her promiscuous also.