As a zombie fan I wanted to get into DayZ, but the controls are all wonky and the AI is retarded and most of the servers don't seem to be monitored or policed in any way (I.E. too many hackers). I guess most of the problems are that it was done on the Arma 2 game, which is fubbed right up in the same ways, I get annoyed with simple things that don't get improved or fixed. See picking things up/looting or breaking your leg swimming beside a rock. The fact that the zombies are a non-issue, kind of puts me off as well, if I want a sniper versus sniper battle with the occasional annoyance I have to walk around a corner from, I'll play TF2 on 2_Fort.
WarZ I haven't seen much of, not sure how it compares, it's on my list of things to look into.