Originally Posted by
Baddok21
to Answer your question as best as possible
MELEE
Rogue - High Mobility, High Survivability, AoE Group stealth, high Single target and AoE dmg along with a mix of single target CC types (Threat redirect will be huge later on when DPS start outpacing tanks again, especially for affixes were kiting is required)
DH - High Mobility, Personal dmg immunity, high single target and AoE dmg within the same spec, AoE Stun (Huge), group dmg buff
Monk - High Mobility, average survivability, High single target and AoE dmg within the same spec, AoE Stun, Group dmg buff
these will be the 3 melee you will always aim for first with the current talents and utility in mind, next on the list would be War > Dk, Survival,Enhance > Feral, Ret (I imagine Ret AoE will be addressed in 8.1?)
The Issue with the DK is that Blood looks to be once again the Top tier tank for M+ so group will look for a BDK tank and a DH DPS instead of a DH Tank and a DK DPS this is because almost all the real utility of a DK is found in its tank spec and its not shared with its DPS variants, meanwhile outside of 2 sigils all the DH tank utility can be achieved with its DPS spec. this is a similar issue Survival hunters will have as its the DPS spec that does not have the vaunted utility that Marks/BM will offer, Survival will be good DPS but it will be shunned in favor of its ranged variants (this also applies to Feral but does not apply to Ele vs Enhance shaman).
the classes/spec that you will see in heavy rotation will be
TANK
BDK or Vengeance DH
DPS MELEE
Rogue, Monk, DH (sometimes Warriors)
RANGED DPS
Warlock, Moonkin, Mage (sometimes hunter)
HEALERS
Disc Priest, H Paladin (sometimes Resto Druid)
(this is the wildest in terms of representation as it will swing from affix to affix IE: dont bring disc to Grievous week)
and there are some new factors due to Raid/Party buffs comming back
VDH - Mage - Warlock - Moonkin - Disc Priest is fueled by the VDH 5% magic dmg taken debuff
BDK - Rogue - Monk - War - Hpal will be really strong on dungeons that have no ranged benefits (and where affixs permit)
however VDH - Rogue - Mage - Moonkin/Warlock - Disc is your one size fits all group comp
all of this can be invalidated due to release date changes though (tuning more than class/spec changes since they said there waiting till 8.1 on that)