It's really stupid, you start a lvl 50 Warzone and if the other team start to win people always start to leave, then there is no way you're going to win or even enjoy that game.
Leavers should get a penalty, something like they can't join a Warzone again in 1 minutes, and if they repeat the same in the next 60min that penalty time should be increased to 5, 10, 15min...
Just to increase competitivy because it is just stupid that "hey well i'm not going to win this, i leave" mentality. Maybe with penalties people will focus more on winning the game instead of joining warzones until others win for them, like pure leechers.