I know, I know... Marcus can be sexist and he is a bit cocky and I did really dislike him at first. Strangely, he has grown on me a lot. He seems to have quite a good sense of right and wrong...
I think it's really important to keep him in at this stage so that we can get rid of Karly or Noirin or maybe even Lisa! Also, he adds some of the more interesting conversation and events to the house.
Keep him now, vote him out later!