[newman]

I really recommend taking this game slow and going for a low/no kills run the first time through.

It's on stealth / no kills approach that the game really shines. That being said, going in guns blazing the first time around to see the high chaos ending, and then doing it "right" the second time around is also a valid approach Really depends on the player. Both my playthroughs were stealth with no kills, I just find the gameplay more fun that way. Easy enough to see the high chaos ending on youtube, though I'll grant that some of the high chaos powers are cool.

[Phantom Hoover]

I'm inclined to disagree: by going purely nonlethal, you're cutting yourself down to using 3, maybe 4 powers and one weapon. It's fun, but you'll end up missing out on a lot of gameplay.