The only critical flaw with Mass Effect is the amount of unrealized potential in a game that gives us the first truly great sci-fi RPG in more than a decade that didn't depend on a franchise property. It has action, it has a compelling story and it even has a little heart. It's the type of game that every RPG fan should play.
What happens when a group of independent developers with a ball fetish band together and start hacking up the latest Unreal engine tech? Something incredible, that's what.
