Power Girl has been written well despite the boob window, but I'm just as sick of jokes about the boob window as I am about the disposable costume.
Besides, nobody is railing against the new, less-skin-showing Huntress outfit. Compare:
The problem isn't "they got rid of the boob window." The problem is they changed her whole costume to something that sucked, and then are trying to walk that back with battle damage because the character doesn't work with it.