The good old feeling of vulnerability, yeah baby.
Thinking back, I think at least 1 pc went down nearly every session when we played HotC (at least through 4th level). I like how it forces players to think about not entering combat when possible. To me it is a great training adventure to teach some restraint to players who are used to just running into every encounter with swords drawn.
I miss the early part of games where PCs have fear...