Giggles_Manically wrote...
Am I alone in this, or is leaving Shianni the most dispicable thing in the entire game?
Definitely.
Every other "evilish" decision can be somehow justified; tainting the ashes to avoid fighting with the cultists, leaving Redcliffe because it's not your fight (it really isn't), killing Connor because abominations are simply too dangerous to let live, killing the Dalish for the sake of a stronger army against the Darkspawn or because you feel the werewolves have been getting the short stick and it's time they get their revenge, etc., etc., etc.
But leaving Shianni to be raped by Vaughn and his men? Unless you believe his "the alienage will burn" crap, the only reason you'd leave her there is for pure greed. Considering she's your cousin and that, assuming you're playing a female, you could've easily been the one being raped, I'd say it's the most despicable action one can do in the game.
Seriously, I can't even begin to imagine the horror Shianni feels when she sees her cousin just walk away and leave her to be treated like a piece of meat.