Star Wars: Knights of the Old Republic (another Bioware IP) might be an even better example -- the story swings rather dramatically on how you play the game, with the potential to kill (or save) multiple characters.
You get 30+ hours of ad-free gameplay (that's > 60 half-hour TV shows), PLUS the chance to replay and experience a new story. (Good) RPGs are the best bang for your buck entertainment-wise.