Was it just me, or was there am animation where a character would hold his hand on his body when he got hit? That animation looked very short, although I'm unsure till I've tested, but combining that with a realsitic staggering back, it would look awesome. Although to keep it from being a huge disadvantage, you should still be able to block while you stagger back.
Some people mentioned that a stamina bar ruins immersion, and I must say, I agree. Maybe to show stamina, the character could start breathing rapidly, and get worse to show stamina drain. Another thought I had about stamina, is that maybe there could be a sort of 'soft' stamina drain, and when that runs out, it begins to damage 'hard' stamina drain. This idea came 100% from H&H's hitpoint system. Combined with the heavy breathing, maybe a character could say something to indicate the loss of stamina. This worked well in 'The Long Dark' where there where no health bars, or stamina, only what the character said to help you know their status.
Also is a health bar really necessary? It seems to ruin immersion and makes the game very arcade looking (I do realise that almost every game has a health bar). Project Reality, and some other games, made the screen slightly blurry with blood around the edges to indicate health, and to be honest, this feels much better.
About heaving attacks- I must say, the idea of them being slower than a normal attack seems dumb. Maybe the delay in getting back to the neutral position should be affected, but if more power = more speed.
Something else I noticed, is that the exact same animation is used for every block, or weapon collision etc. maybe there could be 3 or more slightly different animations, that can be played at random. I'm sure you've already thought of all these things.
In the video, I saw on the Whiteboard you guys had some things listed. I saw REMOVE next to stamina.
edit: wow -3 for a double post... Never again shall I do that....