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.
You know what's really funny, I recently finished playing Deus Ex for the PC (great game, check it out) and went the hardcoe stealth route playing on hardest difficulty.
Obviously, I went the stealth route in this game as well, only using the bow (and eventually daggers, but that is for later) and it surprises me how prehistoric enemy AI is in this game. Like, I snipe a dude dead, then I shoot his friend, who is standing RIGHT NEXT TO HIS DEAD FRIEND and says, "It must be my imagination." Sometimes I want to drag and hide the body, but realize that it isn't necessary in Skyrim.
That sort of thing flew with the original "Thief" game for the PC. Back then, that was considered sooo realistic. Fast forward to today, though, and it seems little effort was made regarding enemy AI.
I get it, you can't ask for everything, and honestly, I'm having so much fun with this game and the visuals, quests, etc. Just yesterday I played for a full 12 hours, something I haven't done in a long time. It just surprises me that not much has changed since Oblivion when it comes to combat and enemy intelligence.
EDIT - I know that Skyrim isn't supposed to be stealth realistic like Deus Ex. I know this. I'm just saying that the AI seems like it hasn't evolved AT ALL since Oblivion.