Agreed. I didn't like her, for all the reasons you mention. I just can't see the Doctor even wanting to consider her a companion. I was glad he turned her down at the end, but furious that he let her get away from the police.

Some have compared her to Jack and argued that people are less forgiving of her - a woman - than they were of him, a man. It's not the same thing at all, though. Jack wasn't conning just to stave off boredom. He didn't leave someone he was in a relationship with to take the rap for his crimes. He risked his life at least twice to help save the situation - and he wasn't doing it for the thrill of it. He was ashamed and contrite once he realised the consequences of what he'd done - and he was willing to take the consequences for himself, rather than run away from them.

I think Christina was a big mistake, and she completely spoiled that Special for me.