No, you're not.
Conservation of detail, people. Oh, there's a really important guy they can't stop talking about. He's dead, you say? He wore a mask, you say?
Probably nothing.
Did it really change anything, though? The bad guy in KOTOR was still the bad guy after the revelation. The bad guy in Mass Effect turns out to be something you thought was a danged prop.
But it's worthless to do this comparison, really. Twists are cheap. Mass Effect wasn't a thrilling story. Neither was KOTOR. And that's all my point is. If the only thing you have to go to compliment a work is a single twist, then it's not an especially good story.