its always a good sign when people find the slightest little loopholes to complain about, it only shows how great this game is and how demanding people are towards it being perfect.
Those are bad, but the one that irks me the most is when I shoot a bandit in the face, run back while I'm still hidden in the shadows, and then after he walks like 15 feet to look for whoever just fractured his skull and pierced his brain with a projectile weapon, he says "ah, I guess it was nothing." as if he thought he heard a skeever running around or something. "Nevermind the arrow sticking out of my head, it was probably just rats!"
the AI is pretty bad.
see there is a big "conflict of interestst" between the AI behaviour and the sneak mechanics there, the AI will have seevral degrees of awareness to which he reacts differently, a arrow hit, will put him in the highest alert state aswell as "pull it" towards where the arrow came from, this will alays lead to detection if the player char isnt skilled/perked in sneak, even if you use stuff like invisibility, the AI will stay at max awareness and follow you through noise and stuff, and attack you.
this is there are 2 more variables there, one is enemey detection, you will notice some mobs will have a very easy time detecting you even if you are skilled in sneak, while others will be pratically be blind to you if you are even average skill of sneak.
the other is the skill in sneak, the higher it does, the more traits your character ignores of the AI detection, such as noice, visibility, movement etc.
so yes its awckward to shoot a target that simply resets its state of alertness because it cant find you, but you have to remember, the rpg component of it, sneak is made so that you "beat" AI awareness like that.
there are issues, minor ones I found with AI, usually pathing related, but to say Skyrim AI is bad, is just flatout wrong, in fact its the best AI of any game I can think of... be it rpg TPS or FPS for that matter.