DayZ (standalone) is good. You just have to understand it's not the complete game yet and there will be a lot of bugs and updates along the way. The potential is there for it to be really good. It's fun right now, it's just very limited.
WarZ was a completely different game from what they tried to make it seem it was. It was complete poo and still is. Steam gave out so many refunds to the people who bought it.