My only bias is that I pretty much detest them all. Truly, I don't give a fig who wins or who does what. They're all famewhores, and I make fun of them. For purely informational descriptions of the house, read the transcript thread.
The halfway party is for everyone. It's a break from the house without really being a break from the house - music is put on so the hamsters know they are not on camera and they can relax for the celebration. Everyone gets to participate, even those on slop (this usually goes for birthday celebrations, too).