If we discard the critical tables and insteads use the injuries from inquisitor (leaving out the wounds difference and such) you can still have a gritty and cinematic battle scene without the merry air of invincibility that comes with the buffer zone of wound values.
I'm on the fence here as Inquisitor has much smaller Crit tables, leading to heavier injuries that can potentially cripple a character in a single attack (as your example pointed out). I like gritty, but I thought that mixing it with DH's Crit tables (which in essence doubles the "buffer zone") strikes a neat balance between realism and entertainment.
However, I'm sure we all draw our own lines regarding that balance, so this is a very subjective topic.
What I do like about the Inquisitor injury tables is that they are less specific than the DH ones. Some GMs might balk at the concept of having to come up with their own descriptions, but the advantage I see here is that they can tailor said description to what actually occurred in the game, rather than slavishly sticking to a pre-written text that may or may not fit to what just happened to the character.