More Bioshock 2 Impressions

I just got to the level where I must save my little sister and have an amazing fight with two Big Sisters.  I'm still very impressed with the gameplay, but still not so much with the story.  I'm hoping a twist or something is coming up soon.  Like I said yesterday, the story is ok, but it's not up to the level of Bioshock 1 (but what really is).  As Quint posted over at Memory Almost Full, once you've experienced the wonderment of Rapture in the first game, how much will a sequel add to it.  I won't be posting a review, just some final thoughts, but needless to say, it's a great game with a mediocre storyline.  We'll see what twists and turns lay ahead as I finish it up.