Hunter
Expose Weakness, Pets

ST--[-------8--]
AOE-[----5-----]
CC--[------7---]
SUR-[--------9-]
SYN-[--3-------]
STK-[----5-----]
MM--[-------8--]
ALL-[-----6----] - 45 Total

Hunters bring pets to the fight, as well as AP buffs for the group. Enemy DMG reduction, and various other debuffs depending on what pet is brought.
They are very survivable due to traps, an instant aggro dump, pets who can tank, and wearing mail.
More hunters means more pets. That can mean more tanks, or different debuffs, or more DPS. It all depends on what you want to bring with you.
A potential downside to hunters is the cost of bullets/arrows.


Druids
Still looking for more information on druids. What do they bring to the fight.

ST--[------7---]
AOE-[-----6----]
CC--[--3-------]
SUR-[--------9-]
SYN-[-------8--]
STK-[----5-----]
MM--[--3-------]
ALL-[-----6----] - 41 Total


Shadow Priest
Stam Buff / Spr Buff (if specced) / Mana-HP Regen for Group / ShadowDmg Buff

ST--[--------9-]
AOE-[--3-------]
CC--[--3-------]
SUR-[----5-----]
SYN-[---------10]
STK-[--------9-]
MM--[1---------]
ALL-[-----6----] - 40 Total

Shadow priests are an interesting thing. They bring awesome things to the rest of the group, but require quite a bit of micro management to get the most out of them. You have to constantly be watching which dots are about to drop, as well as paying attention to what cooldowns are up. If you can manage playnig them they provide synergy ilke no other. All the damage they do gets passed to the rest of your group as both health and mana. They bring a shadow damage debuff as well, so warlocks will get a damage boost grouping with a shadow priest.
Their AOE consists of target-dotting. Not very good at all.
If you stack priests, your group recieves more Mana/Health back, more shields, and more aoe fears.