Been watching some of Sacriel's DayZ videos on Youtube (http://www.youtube.com/user/sacriel42) after someone here posted a link in a previous thread.. I have to say it looks like tonnes of fun what with sniping requiring some attention to ballistics, range-finding and such, and the constant need for resources forcing people to stay on the move. I also like the lack of friend/foe markers and how confused firefights can sometimes get when your squad is spread out and you don't automagically see this information on screen, requiring constant communication like it would in real life. "Do we have someone in the tree-line? DO WE HAVE SOMEONE IN THE TREE-LINE?? I'm taking the shot now!" etc.. Nice stuff.
The major caveat of course, being that you seem to need a squad to get the most out of it. I don't think it looks like much fun if you're on your own.
And too bad about the apparent rampant cheating and duping.