I've seen a lot of complaints about the critical system and how it lends itself to BS deaths... Like dying because you took 1 point of damage to the head, after taking 5 to the leg. So I made a slight adjustment and my players like it.
In my system, critical effects don't accumulate. You take 2 to the leg, use that effect for the chart. Then you take 3 to the arm, you look at 3 instead of 5. Each critical wound is separate and distinct. Even to the same body part. One hit does not make a different hot more significant.
However, people with similar setups have seen a problem with this: it makes characters too hard to kill. So I gave players another stat: critical threshold. Your CT is equal to 10 plus or toughness bonus and 1/3 of your willpower bonus, rounded up. When your total critical damage reaches this number, you succumb to your wounds, even if you never took a hit that was lethal on its own.
Thoughts?