I got the game a couple of days ago, and I'm loving it! Personally I dislike DayZ because my computer can't run it very well and the UI/overlay/whatever confuses me to all Hell. WarZ, however, runs at a comfortable FPS on my machine and it doesn't really seem all that different, minus you start out with stuff (first 5 characters, not overpowered), the map isn't too gigantic, and the zombies are super easy to melee one at a time (boo).
I don't like random jerks that go around and kill you for no particular reason, but there aren't any rules against it. It's a zombie apocalypse, so if you want to survive, don't be seen or blow them away before they shoot you.
I'll be looking for it.