I'm actually really liking it so far. The maps seem a lot more open (KZ2 was corridors galore).
Controls are extremely tightened up, the default controls are more responsive than KZ2's, and its only at about 1/2 sensitivity. The move Controls are ridiculously sensitive, at about 80% sensitivity, the aiming reticule moves as fast as an average mouse. I'm actually doing pretty good with the Move controller, but having to hold a Dualshock 3 in one hand (because I'm too cheap to buy a nav controller) is kind of tiresome.
And it is a lot easier to get kills now. In KZ2, you would have to spent anywhere from 1/3-1/2 a clip to kill a guy, in KZ3 it only akes like 3-5 shots to drop someone.