Who tanks?

[MahoSenshi]

I swear, never gonna do 24 man as RDM or healer or other class again, just gonna go as Tank and tank all the bosses myself. Its ridiculous.

Just use Diversion on a pull and then Lucid on CD. You have some of the best aggro management abilities, use them. I've seen a lot of RDMs who opened with all oGCDs in the first couple of seconds and no Diversion only to die from the first tankbuster.

[AleXwern]

Usually it's WAR > DRK > PLD
Enmity is directly tied to damage (1 damage = 1 enmity, unless skill has multiplier eg. Onslaught has 10) you make as well as WAR has tools like Unchained, highest damage potential and enmity tools like Onslaught with high enmity multipliers. Warrior is natural aggro generating machine and does is most feasibly.

DRK has DA Power Slash which generates more enmity than anything else (4840 aggro potency vs. Butcher 2100 and Rage 1890) in this game as well as DA Plunge and Dark Passenger which too are no way or shape bad now.

PLD on the other hand is the lackluster here. Circle of Scorn and Shield Swipe are very weak oGCD enmity tools (espesially latter because damage was nerfed but aggro wasn't buffed) and Rage of Halone is by far both weakest aggro combo out of 3 and punishes user far more than WAR using Butcher or DRK using Power.

[udubdave]

While it's natural reaction, I'd say opposite should be the way to go. Outside of savage content, MT doesn't have to do anything. OT on the other hand needs to do some important mechanics in few fights, especially now with normal raids roulette.

Personally I try to adjust to sync and players. For example if I'm on lvl 50 WAR I'll try to MT because of no Deliverance and OT when I'm on DRK. If I see other tank(s) are PLD I'll pull.

While it's true that the OT has to deal with mechanics that the MT doesn't, sometimes it's easier to OT if you're new to the encounter because it gives you a better sense of the fight and what's happening around you. Then when you MT it, you'll know exactly what to expect.