CarrionCrow: I think the hit rolls for your encounters got replaced with "let's fuck the player over til they scream".
There is something way, way, way off about your game. I had bad stretches where it felt like my team couldn't hit anything, but I didn't get the enemies with superhuman accuracy part.
I'm getting that feeling. Just for one example, my main character is always the first character attacked even when there are "easier" targets, and that attack often (I would say over 50%) is a critical, even when she's on the other side of the room behind cover.
For a recent example (maybe ten minutes old), she got "one shot" by a boss who scored a 50 point critical. I use a trauma kit and then heal her back up to full health (I got the enemy to avoid her for a round by literally running all my other characters closer to an enemy) the next round. The very next round the boss hits her with a critical which knocks most of her health down, another enemy with a shotgun attacks her from across the room, it hits her and puts her out of action again, a third goon attacks Blitz (using a rifle), every bullet hits and the last one is a critical that puts him out of action.
That kind of stuff has been happening constantly on this playthrough and it's honestly making me start to hate the game, or at least the gameplay itself.
Edit: They did end up finally missing a shot...on one of their summons that they lost control of. Good for me, right? Nope! Their next attack drained its action points and put it to sleep.