Instead of having to rolle on the crit tabel would it not be cool having a deck of diffrent wound types with ranks on them instead of the "stupid" roll a 1d10 1-6 ok 7-10 ouch I find it kinda dull personaly.

Critical damage is cumulative, so you don't roll - if you exhaust your Wounds threshold, the additional amount of damage is Critical. If you're out of wounds and suffer 5 Rending damage to the head (after applying all modifiers), the character's gonna suffer effect 5 from Table 8–22: Rending Critical Effects - Head. Of course, if the GM is creative enough, the effect can be described differently (although I wouldn't modify the crunch too much on a whim).

That said, cards and other tools are always cool to have, so why not.