^^ well, okay personality may not be the only thing, but to say it doesn't matter seems a little far fetched. Are we not told over and over again that they want someone who they would like to teach, and inevitably that kicks off the boring farts and arrogant sods from the list...
Just from my own experience of looking at the 40 applicants from my school, and the 20 who were accepted, with a few exceptions, those who were excepted are the sociable, gregarious, pleasant people, who are of course also very good at their subject.