I think we should create a comprehensive list ranking all of the classes in overall usefulness (PVE and PVP). Please provide your input, as I have only leveled 4 classes so far. Some of this is based on my assumptions and I am interested to hear what you all think. I will update the list accordingly.
PvE
A Tier: Scout, Priest (essential to all parties), Defender
B Tier: Templar (I am assuming with aoe buff), Guard, Predator, Warlock
C Tier: Str DK, Ranger
D Tier: Avenger
F Tier: Int DS, Wizard
Currently not ranked:
Vit DK
Berserker
Savage
PvP
A Tier: Priest (essential to all parties), Guard, Warlock, Ranger, Avenger
B Tier: Scout
C Tier: Templar (we'll see about this)
D Tier: Defender
F Tier: Int DS, Wizard
Currently not ranked:
Vit DK
Predator
Berserker
Savage