Hey man, sometimes obscure characters need a shot too. No one knew about Taskmaster when he was announced for MVC3 and he turned out great.
My problem is: that particular obscure character is the replacement for a very beloved super villain from DC comics .. Captain Cold who would have been a villain for the Flash, one of the most recognizable super heroes in the DC universe.
In this game we get Shazam and one of his villains Black Adam who has exactly the same power set, even though it was said they wouldn't waste slots on clones of already existing characters. Yes, they did make Black Adam play differently and that's the least they could have done, but why did Doomsday have to be in the game for example? Right now he looks like shit, let's be honest here ... And Flash is still villainless.
In my opinion Killer Frost was a bad decision. As an obscure character, because even though she is one, Captain Cold is one as well and when it comes to marketing, he is the better pick anyway.
Breasts? Kick out Doomsday and put in Circe and you have your tits.