Re: Doc's personal plans for Legion.
I find Preach's opinions pretty useful tbh. Looking at things from the perspective of a top player gives insight into the benefits to the raid. Its true he rated pala bottom but he did state that was because of his personal taste when it comes to play style, and that is what his comparison videos mostly look at, to hear his opinions on the other stuff you need to hoke much more through his content.
Pala right now are the kings of raid utility, that's their big strength, and with all the cds that gives them a huge advantage (i'll compare it to the Firelands dk, where the active mitigation was utterly unreliable, the base mitigation terrible, but the massive number of cds made them utterly batshit broken if used well, mind you, my dk had 14 cds with a defensive component at that point, inc engineering stuff though which resulted in some hilarious fuckups =p). Druids and warriors absorb more punishment than any other tanks but damage is lacking and you are completely reliant on the healers for keeping you up, druid self-heal is there, but a bit shit. Monk is potentially the best at smoothing incoming damage, but you need to be timing things perfectly for that and is probably more work than its worth. Demon hunters are currently the weakest (mostly because they have taken over the DK's old problem of relying too much on self healing), which means they'll prob get a little buff soon, but if you look at their scaling, that will make them insane in later raid tiers and most likely they will be nerfed very badly at that point, also, if used well they have 0 problems atm, just that there will be a LOT of DHs that will give the class a bad name as tanks (the uncertainty of buffs/nerfs and the bad rep they'll have is why I've decided against DH in the end). DK, has become my solid choice. It offers very little raid utility, but the potential for survival is nuts, they have more command over their own survival than any other tank, including the more self-heal-reliant DH, considering my relatively undergeared DK was able to solo one of the level 110 sea giants at level 102, they're a bit mad (that was a few buffs/nerfs ago though) and i know that one of the legendaries they can get has the potential to be really, really silly, quite looking forward to having a ~50% uptime of vampiric blood.
As for what i found to be most fun, DK and DH were on even grounds there, with the druid coming in 3rd. Never tried pala, warrior and monk myself in the beta so can't comment too much on them, not that saying which play styles i preferred really says much anyway.
One thing though, ANY decisions you're making based on performance in the pre-patch are mostly irrelevant, artifact weapons have a large impact on how each spec plays, your survival and damage will change considerably as you get to 110 and increase the number of artifact traits and in some specs the artifact weapon changes the play style somewhat. Not only this but the artifact weapons can affect stat priority! Though on that note, haste seems to be pretty damn important simply to smooth out the play style of various specs, at least imo, but then i despise sitting idle, i need to be hitting buttons constantly.
I would say which classes i would prefer tanking beside but, other than giving my 2 cents on strengths/weaknesses, i don't want to influence anyone else's decisions. Simply for how active and interesting the DH specs are though at level 110, they are definitely worth picking as alts (they play so much worse at lvl 100, don't judge them on that) for anyone interested in going for a melee/tank alt, just be prepared to see healers abandon groups if you're tanking on a DH, as i said, they have a bad rep on beta and it will get worse.
WoD main: Malkroth (Resto/Enhance Shaman)
Legion main: Malkman (Blood/Unholy DK)
Alts: Anything beginning with Malk is probably me