Ready up on every class no matter what. Especially close quarters classes. I sprint a lot and the quicker recovery makes my life a lot easier.
Quickdraw on sniper rifles, marksman rifles, LMGs, and slug round shotguns. I use quickdraw when I can't afford to hip fire, or on slow ADSing weapons. My logic behind not using it on buckshot shotguns, ARs, and SMGs.
A beast of the night... I am DARKSTAR! You may shake in terror now.