[optimisticcynic]

A lot of arguments seem to be based on confusion as to whether x,y, or z is a good housemate which is, I suppose different to whether or not we could hack spending five minutes in their company in the real world. So, I'll get the ball rolling with two lists from most to least....

As a housemate, evokes greatest emotionall response (positive or negative):
Spencer, Heidi, Rylan, Razor, Frankie, Ryan, Tricia, Gillian, Claire

"I would find time spent with them worthwhile":
Razor, Ryan, Gillian, Tricia, Claire, an army of angry fire ants in an enclosed space, Spencer, Rylan, Heidi