I have it for the PC and my roommate has it for the 360, it is quite an amazing game. I am about as far as Kappa is, but I’ve fought a couple of the Big Daddies myself and they are amazingly hard and quite a *edited* to take down. The story is amazing, the levels are free-reign, choosing to harvest or to save, etc.. its really amazing.
I don’t know about the AoE lightning Kappa, but I’m sure I’ve picked that up as well as the “heavy lifting” bonus that makes you hit harder, etc. I haven’t picked up enrage yet though, I went and increased my Eve as well as my Health first, especially with the Big Daddies.
Also, when you die, it really isn’t a death. You get “revived” as a Vitastation thing and you’re immediately put back into gameplay, everything hasn’t reset and the Splicers or Big Daddies you can kill are all at the same HP as when you were killing them earlier.
The game just flows seamlessly and the story is great, leaving you wanting and grasping for more.