The combat and AI in this game is halfway idiotic sometimes, and I think that I may as well be playing a Monty Python RPG. Look, if I shoot something in the head and it's got an arrow sticking out of it, it should be dead. Also, if I shoot from stealth, and there's an arrow sticking out of the enemy's throat, I should not hear it say "Huh, guess it was nothing..." or whatever it is they say when they are alarmed but can't find you.
So many sloppy things in this game that really detract from the fun and immersion.
Coming from a long history of regular "hitpoint vs damage" RPGs (you know, sword does 1d10 damage, you've got 90 hp), the whole idea of locational-damage insta-kill thing just bugs me. Why bother even increasing my hp (or my weapon skills, or weapon quality, or anything), if Attack The Weak Point For Kill? is the name of the game?