I've only just played GZ..... and tbh, I find the controls a bit clunky, and it sort of made playing it hard. How do you guys feel about the controls? Is it just me?
I ended up using both a 360 emulated controller (Logitech F710) and keyboard/mouse when I played though Ground Zeroes. The controller gets used for moving and sneaking around. If combat happens then it's keyboard/mouse time. Tons easier to aim and shoot using the mouse. Movement is a bit clunky with the keyboard but that's kind of less important when one has badguys to shoot.