Originally Posted by
SteveRocks
Role importance goes like this, it is also worth noting that the more important roles are also more challenging:
1. Tank: You are the leader of the group. Not only do you have to know every mechanic of every boss, but you also have to know many mechanics of trash mobs. If that wasn't enough responsibility for you, many tanks are also raid leaders so you're responsible for teaching and leading other players. Tanking is the most challenging, but rewarding role in the game.
2. Healer: You are almost as important as the tank. A good healer will know all of the fight mechanics of a raid. A good healer will know when to use specific cooldowns and abilities to correspond to the amount of damage going out during the fight. Healers have to use their abilities both preemptively and reactively. Most healers are not leaders, they are the followers and supporters of the group.
3. DPS: Just stay out of the fire and press your 3-button rotation or I will replace you with one of the other millions of DPS-players that can do your job just as well as you can.