Dual wielding adds a fair bit of damage. Per my calculations, capping out attack (Berserk, Bison Steak) while single-wielding Honorbound, should reach an average weaponskill of 1650 vs lvl 97 XP-type target mobs with RR+GH+Apoc atma. Adding Joyeuse to that (and using Stalwart's instead of Berserk) increases the average to almost 2050.
So yes, no surprise you can get higher averages with dual-wielded weapons than a pld using a single weapon + shield.
Whoa. It's hard to believe a low DMG rating like Joyeuse can add that much to WS output. lol. But, since I don't understand the damage calculation enough to do the math on my own, I'll just have to trust you. (I am curious as to how many extra hits can Double Attack and Triple Attack tag on to Vorpal Blade, though; I would have thought that adding a Joyeuse would cause at most one extra hit.)
Oh, RR = Razed Ruins, Apoc = Apocalypse, but what is 'GH'? Gnarled Horn?
In any case, if I may interpret what you wrote in the context of "2k Vorpal Blade" debate, a PLD who claims to average 2k WS pretty much would need those Atams and this:
Best offensive gear setup I can work out at the moment:
Shamshir +2 (str)
Overall DPS (including Enlight): 224
Using full Creed +2 for TP phase drops DPS to 201, which is about a 10% loss.
Weaponskills should average ~1920 without extra attack buffs.
Or close that, in order to get ~2k Vorpal Blade average on the typical NQ monsters--and thus quite a bit less than 2k on NMs. Is that a reasonable interpretation?
If so, those who claim to see PLDs dishing out 2k Vorpal Blade average on most NMs need to run KParser and stop trusting their eyes.
As for myself, I'm sure I'll be collecting Twilight gear (and Creed +2) sooner or later, but that will take a while. (I'm not sure it's a good idea to eat food all the time, though; it depends on how many people are proc'ing lights and how often the monster is casting or using TP moves--more damage isn't always good.)
So there's potential for pld to be better than commonly accepted, but it hits a hard ceiling pretty quick. If you want to make use of pld's strongest defense, its shield, it's not going to be anywhere close to a regular DD job in damage output, and that vast gulf absolutely kills it in terms of maintaining hate.
I'm definitely bumping into this, but I would still maintain that the root cause of PLD's waning popularity is that there is no need for a real tank anymore, because the monsters are not dangerous or damaging enough to DDs--you don't even need more healers when you switch out the PLD, so there's no gain in putting in a job which is designed (from job traits to gear selection to available weapons) to output less damage than those "real DD jobs".
Of course you could always try to work a different path. Pld gets almost all the same red proc weaponskills as war (only missing Shadow of Death), has access to Cataclysm on staff for cata-burn, and is generally quite self-sufficient (ie: doesn't have to be baby-sat like war). It would seem to be a good choice to pair with nin for farming key items as an alternative to war.
There's a thought. Though, that means now I have to find time to skill up all those things. /sigh