Yeah, i do think they’re pretty ineffective. I understand not using disguises as the tutorial does point out that 47 is doing something different.
However, I think maybe a few should be more effective. The closest we really get is the ambush. Not even the sniper dude does anything. Perhaps he could have taken shots at you if in that area out of disguise or compromised.
Still, it’s a great mission, even if the rest of the agency seems to be terrible at their job!