Many people leaving bad reviews here either haven't played in the most recent update or didnt play long enough to get good and enjoy the game. The biggest issue with the game isn't the game itself but the countless cheaters and bugs. Looking past the bugs and cheaters the game is like no other. Dayz is always getting updates to fix bugs and get new content, the combat is punishing and gives you a boost of adrenaline, and the unique encounters are fun. But the game has so much more to offer. I would give it 5 stars but the hackers and bugs that the game has brings my rating down.
If you you have patience and like brutal survival games (Dayz legit has to be the most brutal and unforgiving game I have ever played or even seen) then this is the perfect game for you.