I keep seeing people complain that there is not enough action in DayZ, the map is too big etc. I think a lot of people are missing the point about DayZ. The whole point of the game is that it's a zombie SURVIVAL game. That means keeping your character alive by searching for food/water, fending off zombies and very occasionally run into another survivor.
If you want a call of duty pvp battle royale situation then go play PUBG or something.