Similar to Gears, I was a big fan of GoW1 (never played 2, sold 360 right afterwards).
I played with the sensitivity, and it helps but still not as fluid as COD. I was playing campaign, but I was in a MP mind frame trying to see what it would be like if it was multiplayer. Didn't like the melee attack, it's basically hitting with the stock of your assault rifle. Not 100% sure, but I think you have to equip knife in order to use it. GoW melee is the best i've ever seen with the chainsaw, sick. I wasn't enthralled with the KZ2 demo, very short. For me, it's GoW > KZ2. I really hope KZ2 MP is more like COD, with the perks, secondary grenades (smoke, flash etc) etc..