Kinetix' lightness and the whole wardrobe thing didn't appeal to me, too Millie the Model comics (which I loved as a little girl). Many people like costume redesigns, though, especially when they're just temporary. It's her serious moments that endear me to the character. I know she gets into some trouble with artifacts of power at some point, but isn't she generally very competent throughout the series?
While I was initially actually distrustful of her because of the whole power thing, her depiction won me over with both her silly nature, as well as her down-to-business nature on mission, and especially as it came to her relationship with Vi.
When she was well written she was extremely competent as in where Ibby mentions, as well as in the last DnA sequence just before they altered her.
But the best part to me was her irreverent contrast to most of the rest of the Legionnaires. It was a nice counterpoint.