Thoughts thus far:

• Starts off significantly slower then the first one.
• Weird being a Big Daddy but your health isn’t significantly higher than the splicers. I know it’s for balance reasons, but the game doesn’t explain why you aren’t as strong as you’re supposed to be.
• Graphics are superb; you can see the love they took in evolving the look of Rapture. Playing it in 1920x1200 with super high setting is amazing.
• The story is … lacking thus far. Because you’re a no name Big Daddy, there is no attachment to my character. I know this is probably planned, but it doesn’t excuse the fact that I could give two shits about my character.
• I wish there were more customization in regards to the plasmids, tonics and weapons. Right now, character customization is totally tied to game progression. I had hopes this would change as the game progressed, but like I said, I’m halfway through and it’s no different.
• The game play is exactly like the first one, for better and worse. It’s story driven (good) but it’s on rails and the events are exactly the same from #1, mainly the “go here and get X to open the door in B” variety (bad). I was hoping for some more variation in the game play elements, but it looks like the developers took the “if it ain’t broke, don’t fix it” approach.

Overall, it started off very, very slow but now that I’m in the swing of things, the game is getting better. I’ll report back once I finish it.