I'm not sure how much I can say here without crossing a line so I'll do my best. The short version is that I don't care for dual wielding. Not as it works now at least.
Also, this idea that Martial Arts synergizes well with other skills and thus can be nerfed to oblivion is annoying to me. I could say the same about Long Blades, Short Blades, Pistols, Rifles and SMGs. They all synergize well with other skills so they can ALL be nerfed into oblivion if that's our argument. Even Brawling and Melee synergize well together and while it is certainly less, it's still there. Lots of skills can synergize.
Long Blades:
This skill was already the awesomest. Damage was great. It synergized well with other skills (MA's not the only one that does this) and you can do things with swords you can't do with any other weapon. I don't think they needed yet more of a boost from Dual wielding.
Martial Arts:
Synergizes well with other skills on par with Long Blades, Knives, Guns and the like. Unique to MA, when you use a staff you are actually less effective in a fight in one specific way than you would be without it. There is a penalty to using a staff. I was specifically told this was because the Staff was great at parrying. It was a trade off. And there is no other option for MA. It's bare knuckles, two handed staff or nothing.
Brawling:
Brawling Synergizes well with melee. Brass Knucks do good damage and are pretty much the best 'uanarmed combat' weapon in the game. They do not suffer the penalty in combat that staff users get. But that was okay because they didn't used to get any kind of parry bonus. Well. Now they do. And you can see how nice this is in game. So the supposed benefit staffs enjoyed at the cost of a penalty is no more.
Melee:
Synergizes well with Brawling. These guys are hit just as hard as Martial Artists. If you use melee weapons you are likely going to have to make a hard choice that Swords, knives, brawl and gun users will not have to make. If you are a melee fighter you usually have to sacrifice damage to dual wield and get the parry bonus or take the damage without the parry bonus by using a two handed weapon. Only other skill that faces problems at this level is MA and they just don't get a choice at all.
Short Blades:
Another skill that synergizes great with many other skills. Just aswell as Martial Arts and Long Blades and guns can synergize. But I don't think that dual wielding takes an already powerful knife skill and makes it yet more powerful. Knifes always felt middle of the road to me at best. So it is a boon to knifers. Luckily, they can just dual wield and enjoy. No hard choice needed.
Pistols:
Similar to short blades and long bades and brawling (no hard choice). But I personally am not interested in seeing more pistol users who are supposed to be maintaining distance blocking sledgehammers with their guns. Granted, it doesn't happen often but I suspect dual wielding just makes it happen more often. Oh. This skill ALSO synergizes well with other skills on the same level as MA, knives, Long Blades and the like.
Rifles:
Yep. Never gonna get it. No parry for you. Same boat as Martial Arts really except it makes more sense given how you use Rifles. Oh. This skill also synergizes well with other skills.
SMG:
Same camp as Rifles really.