She's basically EmmaFrost without the redeeming qualities or stylish costumes, or a feminie Jason Todd circa Countdown, just incredibly caustic and condescending to everyone with a healthy dollop of Japanese stereotype dumped on top.
Where Infinite Crisis gave us Super-Boy Prime and Final Crisis gave us the Human Flame, COIE gave us Dr. Light. Each one is the embodiment of everything bad that happened in heir event (although, in the Flame's case, literally).
The character is, like Hush or Dark Mary Marvel, just painful to look at and annoying to read and I wish they'd bloody well kill her off already. In Blackest Night, hopefully.