quoting myself from a while ago about Hitman:
The way the disguise system worked made using disguises a a greater challenge, but not in a way that makes sense. Anyone wearing the same type of outfit you are will recognize you if you're in their line of sight for too long or are too close (the threshold for detection for both variables decreases at higher difficulties). I get why it was done and I greatly appreciate the devs trying make using disguises are more involved process; I should be at the edge of my seat if I'm walking through a room full of armed guards who might realize I'm not one of them if I do something out of the ordinary. I should have to actively try to stay in character or divert attention from myself.
The problem is that (at least on Hard/very hard), enemies would become suspicious in a really unbelievable way and ridiculously quickly. It made sections of the game appropriately tense, but in ways I doubt the developers intended. I often had to crouch and sneak through areas while in disguise because of this suspicion mechanic. The "hide face/look away" move that would counter this was tied to the instinct meter, something that only gets refilled by performing certain actions (and doesn't exist at the highest difficulty level). Being able to casually hide your face while passing past other people who would believably recognize whether you're in their group is cool, but having it tied to this meter rather than making it a somewhat unreliable move (either based on chance or timing) is silly. It also sucks that one a particular person becomes suspicious, you get no chance to talk your way out of it or divert attention; you have a certain amount of time to knock them unconscious, kill them or take them hostage once they draw a weapon on you.
Again, the way it works in this game does make some segments appropriately intense and challenging. When you have to escape the apartment building as cops search for you, I couldn't just knock out a cop, take his outfit then waltz on out. I had to be careful throughout and waiting for the L train to arrive was actually intense, what with cops interspersed through the crowd. The way I played that section (crouching while in disguise, walking past other people) was dumb though.
I hope a future Hitman uses a new disguise system and doesn't just copy Blood Money because the potential is there for interesting gameplay options and intense moments. It would really help to make that disguise system fit within the game world though. The more scripted moments are fine in themselves, so long as they aren't as frequent as in Absolution and still leave you completely in control with a reasonable amount of options. Stuff like that scene in Deus Ex: human Revolution where armed guards rush into the office you're in (you can stealth kill/incapacitate them, sneak through them, shoot them, or avoid the entire room entirely) is great even though you're forced to act within a time frame.