best classes

best classes and specs for dps, tanks, healz?

Warrior > DK > Shaman

Easiest DPS Class: Warrior (*Note Warrior is insanly strong aswell)
Strongest DPS Class: Death Knight (and warlock maybe, but its very difficult to be good.)
Best heal: (In my opinion): Palading & Druid (got good heals & good survival)
Best tank: I do not know, don't PvE :)

Easiest DPS Class: Warrior / Frost Death Knight / Hunter
Strongest DPS Class: Death Knight, Warlock, Hunter
Best heal: (In my opinion): Druid / Druid / Druid / Mistweaver
Best tank: Paladin / Monk / DK / Druid / Warrior / Shaman

Well my main is ret paladin and i gotta say at healing and dps its pretty nice, but very fragile at tanking. I remember doing a heroic pandaria dungeon and those monsters would have killed me in like 3 seconds if the tank would have not taunted them.

Easiest DPS: Warrior/Hunter
Strongest DPS: DK/warlock/warrior
Best heal: Mistweaver monk (pvp) Resto dudu (PvE)

Affli lock? :D

From what i have read and been told, this is how I understand it:

When all is fixed, and only PvE:

Best DPS, if you are unskilled: Hunter, I think survival spec. Frost DK, for mDPS
Best rDPS, if you are skilled at your class: Affli lock (hardcore on difficulty level), or Ele Shaman
Best mDPS if you are skilled: Ret pala = Fury warr

This tier favored absorbs rather than throughput, so:

Best absorb healer: Disco priest
Best throughput healer: Holy paladins.
Then we have resto shamans. Great AoE heals, good raid utility buffs. Always a good 2nd heal to bring along. Very likely to get slots in your guild's raids.

Tanks are where I have my fun. MoP is very easy to tank in, provided you don't stand in the fire. Think about throughput vs absorbs again. Progression will favor absorb defenses, and general high-end (in a year or two) will favor throughput. Prot Paladin is easy, with powerful group- or self-heals and are adaptable with their glyphs and talents. It is tough to be a bad tankadin. A little below on utility are Blood DKs. Good self-only heals, a little better than Tankadins, but their defense is going to be below the tankadin. Highest DPS tank will either be guardian druids or brewmaster monks... Depending on our coding. Warriors are a tough one. If you are good, it will be the best class. If you are not, it will wipe the raid over and over.

Think about your offspec too.

mDPS and Heal: Shaman
rDPS and Heal: Priest
Tank and Heal: Paladin
Tank and DPS: DK

Added note: for PvP and Fun: frost mage, holy priest and arms warr were the most commonly represented above other classes in rated PvP. Something to do in between lockouts, if you want. All classes are viable in raids. Sometimes the most fun ones are going to give you, personally, a higher average DPS than the less interesting ones for you, even if the dull ones are simulating at higher numbers than your favorite.