I'm not so cynical on this one.
Lisa may not be able to stand living with Marcus, I mean I know he's great telly. but even I would certain things a bit annoying to live with, but it doesn't mean she hates him. Even though they are not exactly chums, I think they have an understanding.
I like Marcus [2nd fave] but I don't think he is as black and white as he makes himself out to be. I think he has a really soft, caring centre but doesn't like to advertise it.