And upon snapping a guys neck, I heard it echo. O_O

That was slightly unnerving.

But yeah, the biggest Issue I have with the game is the moments when the AI just goes mental.

I strangle a guy, I'm spotted and they popped off a shot at me, and I ducked behind a wall and they lost me...

Twice.

Most of the time this doesn't work, but every so often the AI forgets to think properly.

Edit: Also, setting off a Molotov doesn't seem to draw attention. O_O

Nor does the man burning alive. O_O