Civilians who say: "Hm, I think I'll just run in front of that guy's car, get killed, and make him lose $20,000.
Mercenaries 2.
More irritating sandbox game AI perks (that I don't ever want to see in a game again:
Stupid Pedestrian AIs
I'm speeding down the street (on the lane closes to the sidewalk, and NOT on the sidewalk) and instead of a pedestrian AI jumping away from the street, they jump IN the street. Right in front of you. I don't wanna swerve out of the way, so kiss your artificial life goodbye, artificial moron.
Culprits: Saints Row, Saints Row 2, Grand Theft Auto IV
Stupid AI Traffic
When you stop in front of a red light, the dumb AI doesn't realize the light is red in front of me and tries to go around, usually either clipping the back of my vehicle or ramming into oncoming traffic. (Clipping my car will wind up with them kissing lead, because I never hesitate to put a fool on the ground).
Culprits: Every single sandbox game made (edit, except the Mafia series).
Useless AI Friendlies Revisited
I know the useless AI partner has already been mentioned, but boy is it relevant in every game I play. The AI either cannot discern the environments around it, or it does stupid noob mistake that forces me to take on a team alone. Seriously, Asoka? You are going to send all your troops across the world and have me take on a power that's 2.5x more powerful than I? This is more than them being more of a burden than helping you. This is about them being completely negligent about the whole picture.
In TES: Oblivion, whats the point of summoning creatures, if the bandits go around them. Seriously, my female pure mage Bosmer has only 60HP. 60 <snip>ing HIT POINTS! She cannot take more than 2 hits. Block those stupid war hammer wielding psychos from hitting me! Seriously. Can I get some <snip>ing help around here?!?
Whew, my mini-rant is over. It's time for me to go to bed.