Let me start off by saying that I'm not a HUGE fan of FPS games. I'll play them, but they have to be really good to keep my attention.
I played the first Bioshock. I thought it was OK. I never really understood why everyone raved about it so much. It was just OK. The atmosphere was cool and original, but things like the hacking game got repetitive and boring, and I got sick of constantly scrounging around for ammo and loot.
Bioshock 2 is ... exactly like the first game. It's fine, but nothing really stands out for me. It's so familiar, I can't imagine why it took them so long to bring it out. Isn't it all just recycled material ? Also, all the impact of the originality of the first game is gone. Rapture is familiar ground now, and it feels less scary now that you're a BigDaddy who belongs there, rather than a frightened intruder.
I'm only a couple of levels in, perhaps there's more later to spice things up. Anyone further in ?