K' is fine the way he is. I mean, he's not broken, he's just really good. It's like complaining about Ryu/Ken in the SF games, they're not broken, just really good.
Liz is a little broken with her easy link into DM. Then there's the infinites a few characters have. That shit will probably be nerfed in the console port.
But keep in mind to do what the Raiden player did you have to hold down B and K for 16 seconds so it isn't an easy link. My guess is that the dmg may be nerfed a little bit in the console port, but I don't think that's necessary.