Well regardless of all the glitches, I finished single player last night. I will say the ending was astounding, but there are some loop holes in the story that made me wonder why in the hell they didn't explain. I like how the first game was re-told in a sense via pictures and audio files, it even answered a few questions I had from then. Yet the main villain in the game was a grave disappointment, she was interesting and smart, especially to outwit Andrew Ryan's logic at every angle. Yet, couldn't deliver what Andrew Ryan or Fontaine offered in terms of being a super evil genius. The part that will really make you upset, as much as I don't want to say this is, is YOUR great reward at the end. Which I will leave it at that. Getting to see many new areas of Rapture was thrilling, you never re-visit old places from BioShock 1 which I'm glad they didn't recycle that. Graphical difference from one to two will still impress you I will say, including the new shadow effects. It's pretty cute when you can see your own shadow and the shadow of the little sister you're carrying for example.
Multiplayer mode I tinkered with for a few matches. So far my favorite mode of play is, "Capture the Sister". 5 vs. 5 match. Which plays like Team Fortress 2's style. Yet the coolest surprise was the introduction prologue to the Multiplayer match from your character's own apartment. Which to me, gave a clearer picture of what it was like to live in Rapture.
So bottom line, it delivered something that we thought wasn't necessary since I still feel the end of BioShock 1 was enough, but it's impressive for a sequel to try hard to connect everything, and somehow leaves much unanswered to open for a part 3.