Yeah, stealth is also pretty broken since you can sneak past encounters etc and actually ambush enemies which are supposed to be ambushing you.. Which I suppose is fine, except it works out VERY "not as intended" since invisible enemies spawn in right next to you and get slaughtered.
Also sneak/snipe = invincible Etc etc.
As interesting as it would be to have the AI use the same exploits as you, I think it would feel "not as intended"
