it has been said like the best zombie videogame ever, and the best mod of the year; the mod developer have been assumed by the company that developed arma2; in this september he has reached the number of 1.5 millions of players ( O.o yes !) , but it is very very harsh if you don't know well what to do and how; it can be really really frustrating, but it can also surprise and become a dependence; they have said that nobody expected anything so innovative in a fps game.
it's good mainly because of the arma 2 engine. i feel that when warz and other copycats release their efforts they will miss what makes dayz so compelling - the difficulty (realism).