I hate several complications, but the one I really can’t stand is “Sticky Gun” or whatever it’s called. The one that forces you to have your gun always equipped, even in plain sight, and you cannot unequip it for more than 7 seconds. Like, if you don’t jump down off a edge fast, you can actually fail the mission.
Also, I hate “Hide All Bodies”, expecially if it has a timer, because I usually just leave 'em around but in places where they can’t be found, so I still get SA rating.
This one, instead, forces me to take care of every single one of them, wasting time and making me get nervous.
There’s a special place in Hell for Devs who used these in Escalation contracts.