Looking at video games from an artistic viewpoint, Bioshock 2 might be the most unnecessary game ever made. Bioshock was an incredibly satisfying self-contained experience, and there's just no way to have a sequel make sense. How long can a city at the bottom of the ocean be run exclusively by insane, drug-addicted zombies before a poorly maintained pipe breaks and the whole place floods?
And yet, I can totally understand why Bioshock 2 exists. Someone said, "Hey! There's a really cool shooter at the core of Bioshock, and people would probably like to play more of it. Also, we like money."
So my review of Bioshock 2 is this: You can get the magical ability to make swarms of bees, and they fly around killing your enemies, and when they kill someone the body is infected with bees, and when a different enemy gets close to the corpse it explodes and makes more bees.
How can you not want to play that game?
Also, early on, you can get the ability to freeze the enemy you're fighting. Once you have it, all boss fights become completely trivial for the rest of the game. Once, when I was younger, I would have seen this as a flaw. Now I am old and slow and I think games just get too darn hard, so the ability to instantly freeze and obliterate everyone is awesome. In my fantasy world, I don't want to be a loser who is incapable of ever succeeding.