Critical hits, critical failures, disfigurement and crippling wounds, are all fair game in my campaigns. I like my material really dark and gritty which is why i favor WFRP more today than ever before. If you add these elements i listed above, as well as always giving the character the feel of risk, no matter his or her level, then you have my interest. Also, and this is my m.o., i never let my players choose their crippling wounds.
Good thread, Descronan... don't know how i missed it.