Crouched is definitely way too slow as is raised weaponry. Sure being that slow when crouched adds a stealth vibe but it completely removes any sense of immersion or authenticity when the fastest you're able to go whilst crouched is barely a fast walk.
The weapon raised is ridiculous as well, moving at that speed with a weapon raised irl is a bloody good way to get shot. The combat pace in A3, had it done alright and considering they're borrowing the sway from their I don't see why they shouldn't borrow the combat pace speed.