What Big Brother Teaches Us About Game Design

Thanks to Skotos.net for their article discussing why the TV show Big Brother 4 is an example of good game design, and what we can learn from it. It's pointed out that "a group of n/2 (rounded down) + 1 people can dominate the game", if well-organized, but "the producers of Big Brother have made changes which dramatically reduce the power of a majority", including the ability to veto potential evictees. But it's argued the jury of previously evicted players voting on the final two contestants means "...if you backstab someone or betray them, even if it gets you further in the game, it could prevent you from winning." Is there a perfect strategy for winning Big Brother, and if not, is the concept of "unworthy winners" dissatisfying?