By "the antagonist in BioShock 2," you mean the Big Sister, right? I really don't know much about her except that she was a Little Sister who came back to Rapture, donned a female version of the Big Daddy suit, and basically took over. I like the fact that she will be hunting you throughout the course of the game. This could possibly make the second game scarier than the first, even though you play as a Big Daddy. If it's the Big Sister you're talking about, then I'm not disappointed. I was hoping she would have more depth to her than just being some ominous force who hunts you for upsetting the balance. It will be interesting to see how Rapture being ruled by the opposite end of the extremist spectrum will affect the city. Personally, I can't wait to see what crazy plot twist the developers will put in this time. The team knew that people who played the first game would be on the lookout for a plot twist, so they're promising that nothing in the first game could prepare you for what will happen in the second one. You'll never see it coming. Let's hope 2K Marin can live up to their promise!