Right now… I would probably say that asking everyone’s opinion, it would be the class that they are currently playing.
Rogues are getting a rework, so until we see what that looks light, they are undecided.
Every other class/spec depending on who you ask, is going in the wrong direction.
My personal opinion, is first hunters, particularly Survival. I play it, and its not that bad, but it just feels like two different people designed it, and they didnt communicate to each other. Then half of each design was taken and mashed together. There is potential there. But mastery only affecting half or less of their dmg is a problem. MM hunter has had its niche chipped away at, which was AoE/Cleave. The spec itself has bones, but not a lot to flesh it out. And BM is in an odd spot. It can only perform so well, otherwise it will be too good, so it always hits a mid expansion plateau.
The main issue is their survivability and utility. The class as a whole really brings nothing that other specs cannot bring. But other specs of classes, bring utility and survivability. For this flaw to be ok, Hunters would have to do top S-Tier DPS. But they dont, so they are in a pretty bad spot.
The other Class I feel is going in the wrong direction is Monk. For some reason I just feel like none of the specs really work. Both thematically and functionally. WW monk’s design is both flawed and good. The problem is that they cannot figure out what to change or balance in order to have it have meaningful single target with less AoE, or Blasting AoE and less single target. It has an interesting mastery and utility. It has decent survivability. But it can either blast AoE, or sacrifice a bunch of AoE to do tank dps single target.
Brewmaster feels off. It feels like they just gave it every single monk button that they had. It is complex, but not in a good way. Its mitigation is great, but it feels like it poorly synergizes with its kit. In a lot of ways, it feels like the mitigation buttons and the DPS buttons are completely separate in their functionality and the two halves of the spec operate independently from each other.
And MW Monk, it probably in the best spot of the three specs. But due to it being a roller-coaster of performance tuning based on patch, and it not being a very forgiving healer to play make many avoid playing it. And when I say its unforgiving, I mean that it takes skill to play and utilize mana. You can go OOM very quickly. It has a good healing kit, but it doesnt really bring anything other healers dont. And its raid external does not compare to other classes.
And lastly… Warlock. I really like playing Warlock. But it just feels like they dont really know where they want the spec. Demonology keeps getting propped up by PI. And keeps getting the bulk of its DPS shoehorned into CD windows. Which makes the time in-between those windows pretty dull. And makes messing up one of those CD windows just feel awful.
Destro has a similar issue. Where it is fun during its CD windows, but outside of the infernal window, its dull to play. There needs to be a way to have more frequent ramps. Every min or so, there should be a fun dps ramp. Some more proc based gameplay to add a little spice to the spec. Its Destruction. It should feel a little reckless and dangerous to play.
Affliction. Malefic Rapture. Need I say more. It does not feel good to spend shards on it. And not being able to control shard generation, hinders how the spec feels to play. There needs to be a way to have the DoTs be the star of the show. To extend the DoTs through gameplay and have the ability to cause them to deal increased damage, without making them broken in AoE situations. Also ditch Observer. It is not an interesting CD. And cramming AoE dps into a 3min CD isnt fun or good.
These are my opinions. Not fact based. Just feeling based.