I haven't finished it. I'm just not enjoying it like I did the first two. It's too formulaic. Too predictable.
Like, there's nothing wrong with the mechanics. It's about as fleshed out and polished as the other two games. The problem is the basic shooting wasn't the focus in Bioshock 1, it was a single part to a controlled chaos. You could forgive the shooting not being fantastic, because the shooting wasn't the one and only thing happening, there were times the games various systems could come together to surprise you. Something random would happen. I've replayed BS1 and BS2 about a dozen times between them and I still get surprised because of just how much is happening.
Here, you don't get that. All you have is the shooting. You have no other elements for it to blend with, no chaos, no unpredictability, nothing to help the basic gameplay along it's way, just enter room, shoot guys, leave room. Next room, Handyman appears, kill, leave. Rinse and repeat. It's Call of Steampunk.