I played about half an hour last night and had a good amount of fun in it. Ended up spawning next to the southern airfield. Equipped myself with an M4, some ammo, large backpack, jacket, some food, but no water.
Came across 4 different people in that time, 2 of them armed. I saluted at them straight away and they left me alone - so straight away it's better than the mod!
I did see one guy with a crowbar who found me in a house bleeding from his penis. That made me laugh!
Performance wise I maxxed everything on the graphics apart from AA and got a solid 60fps throughout (I use driver-forced v-sync), no dips at all - so once again, better than the mod which even on an i5 2500k, 8GB RAM, GTX770 didn't run well.
Going to play for an extended time tonight. But after my first half hour I'm fairly impressed.