The problem with them is that they are just plain old boring AI as usual. Slowly creep around a corner and blast one in the head with the revolver. The other 5 in the room don't even care. Plant a bunch of trip wires and go hide. They will stare at them for a minute and then run through them. The moment you enter their line of site and they are alerted though, they instant 360 noscope headshot you for ~40 armor damage before you can even get your gun up.
I don't even see the point of armor because you lose it all after one encounter unless you save and reload like a fiend. I remember in the first game, I couldn't hide. They would grenade me and flush me out. In this one they all pile up in a narrow door while I pick them off.
I can't really fault the developers here, it's a free mod. I just don't think the AI should be given much credit, it's standard fare at best.