Well in feast 4v4 you need to work with your team and set up a plan..oh wait...But best i can say for feast is work with your group and keep the healer harresed dont have to kill them solo. Or as a WAR what i see people do is just help burst down the DPS/Healer before they can do anything. Best thing you could do is talk with your group.....

But a very useful guide for alot of the modes/etc can be found on pvpaissa.com