The problem with crouching is you can't please everyone, without spending a lot of time and money on it. You could have a crouch be realistic. If you crouch in public areas where everyone can see you, you draw awareness, and attract a crowd.
If you crouch in isolated areas and someone sees you, they act surprised, and speak loudly (to you or to someone about it).
If you crouch and you aren't seen, no one can hear you sneaking up on them.@The Stickman
It isn't getting critical acclaim. It's getting B-ish and mid-80's-ish grades on average. That's good, but not critical acclaim status, like Halo 4 is getting.