(OK, so: the entire game is ghostable and if you're relying on whacking everyone, then you're coming at it fundamentally from the wrong perspective. You're a vulnerable lone thief there to not make a big fuss, you only blackjack people or cause a scene when you have to. The whole game is about hiding, observing the guards' patrol routes, and mapping the place out in your head, thinking up an escape route, and then jumping from safe spot to safe spot. )
You *can* whack everybody if you want, but if you're not feeling a sense of dread and wanting to stay as hidden as possible, then you're not really going to get the most out of it
It's about a gentle water arrow to create zones of darkness to paddle around; moss arrows to get over that metal floor carpet; the thrill of slowly crouchwalking past a couple of guards chatting about whatever 15 feet away.