I'd like to note that there is a mirror class for each faction. If you see an Order class that seems fun to you, but you want to play Destruction, then you can just play the Destruction equivalent to that class.
Direct heal based healer: There is no resto druid HoT based healer and solely direct heal based healer in WAR. Instead healers differ by a mechanic specific to them. Shaman and Archmage build up 1 point (waagh/high magic) whenever they heal or nuke, up to a maximum of 5. Healing builds up nuke points, and nuking build up healing points. Whenever you cast a spell all your point in that category (healing or nuking) are then spent. So if you nuke 5 times in a row your next heal will be better, such as more powerful or having a faster cast time. The Disciple of Khaine and Warrior Priest are melee healers. Instead of spending AP (mana) to heal they use a pool of soul essence/divine fervor. They spend AP (mana) on offensive abilities to gain more SE/DF which they spend to heal. Zealot and Rune Priest are the last type of healer and mostly lack a mechanic. I suppose you could say they are more flexible by not reaping the cost or benefits of the other systems.
HoT based healer: See above
Heavy armor healer: I haven't had a chance to experiment thoroughly with all the support classes, but the Disciple of gain is a melee healer and is supposed to be a little hardier than the other ranged healers. However, he is as tough as a plate wearing paladin.
Heavy armor tank: Some a similar situation to the healers. The Chosen is a tank with auras that can aid allies or weaken enemies. The Black Orc is a tank that unlocks higher tiered abilities by using lower tier abilities. I don't have enough tank experience to really say more.
Avoidance tank: see above
Melee dps: You have quite a few options. Witch Elf and Witch Hunter could be likened to a rogue. They have stealth and are soemwhat fragile with a few tricks on hand. Marauder is a hardier melee dps that mutates his arm into one of three forms to aid him (either AOE, direct, or bleeds and debuffs). White Lion is a melee DPS pet class. HE always has his lion pet with him to help him in battle.
Physical damage ranged: Shadow Warrior is a class that is all about using his bow. He has three distinct stances that help him out at either long range, mid range, or close range. Squig Herder is also an archer, but he has a pet squig that helps him in battle. I suppose the Squig herder is somewhat similar to a Hunter. Finally there is the Engineer. He uses a rifle, grenades, and can lay down turrets.
Magic damage ranged: Bright Wizard and Sorceress are glass canons. Some of their spell build up dark magic/combustion that gives them an increased chance to critical and bonus crit damage (up to 50% bonus crit chance and 100% bonus crit damage), but it is dangerous for them to max out their dark magic/combustion as it increases the change for a spell to backlash and deal some damage to them as well. They can spec into aoe, direct damage, or dots. Magus is a mirror for the engineer. He can summon demons that will attack targets within the summoning circle.
... anything i'm missing? hybrid between these types?
Edited, Aug 21st 2008 4:22pm by Allegory