Hardest Class/ Class Combo

Based on exactly how you defined it, the socially hardest Archetype to play will probably be Rogue.

If the game is challenging, then being out of position will be dangerous and cost your group speed of progression, and in PvP situations, possibly cost you the fight. Rogues are often positional Damage Dealers and sometimes assist with threat/hate control in complex Trinity games.

So you have a class that needs to be in the right place at the right time for their DPS, but also might be able to randomly (evasion stat based mitigation) take big damage if they stay too long or go too early, also being responsible, potentially, for part of the 'making sure the group doesn't die', and on top of all that, being expected to know lots about the timings of enemies. Then they're still susceptible to 'people not knowing what they're actually supposed to be doing', and likely to be unnecessary for certain content types, meaning they would have a hard time finding groups during the phase where people want to be 'efficient'.

A very GOOD Summoner has this problem too, but in many games they do this sort of thing moreso by choice. Whereas often, for the Rogue type, it's a requirement from moment one.

Since the game is generally 'PvP and disruptions can always happen', a Dungeoneering Rogue is likely to also be required to have some Fighter or Tank Augments, so I'll say the hardest class will be Duelist, based on my experience.

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A surprising response from you...

The Primary Archetype of Rogue will have Rogue skills. In some games, which is open for discussion in this case, the Rogue has Primary abilities that involve manipulating hate and threat to assist the Tank. Since the Primary abilities would, in that scenario, be the source of the 'Support' I am talking about, that's the basis of my point.

Basically, I was never considering augments at all, nor damage.

If you were addressing the point about efficiency, your choice of how to address it is also unclear to me, and I feel like I'm not going to 'get it' until you explain it differently. As it is, I can't connect the speculative (but very likely!) statement you made, to what I was saying.

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I'll certainly accept that being up there on the list, but I don't think those classes (as a Bard myself) can possibly be on the top. We at least have the ability to direct complainers at their competitors and step back if we want to. "Sorry, I either had time to refresh the Mage's mana OR give you an Attack buff in addition to the Accuracy one I was giving you. It's that or drop the Tank's elemental resistance buffs."

The inevitable "well obviously you shoulda done that" starts a war I don't have to fight. I don't envy the rogue who can't keep up with the enmity redirection, or misses some DPS synergy because one of their teammates was an idiot and forced a different one to reposition, which then ruined the Rogue's positioning at a critical moment. That "wtf? I have nothing to do with your job, don't go making excuses for your suck" that always seems to come from the least skilled player in any group is not something I envy.