The Nitty Gritty of Scaling
Beyond the arguments related to RP and lore are the arguments related to scaling and viability. Ghostcrawler has said that dual wielding and 2-handed weapons should be interchangeable and equal at the end game. Whether this is actually achievable is very much in doubt. Once you have adequate hit rating, for pure DPS, dual wielding traditionally works better. Dual wielding does more overall white damage. For Death Knights, talents like Necrosis and Blood Caked Blade will scale better with dual wielding. AP scales better with dual wielding. While we do have many weapon-damage related strikes that scale better with 2 handers, there's some question as to whether they will scale well enough to keep up in the end game.
As the dev team works to firm up Death Knights and get them ready for release, there is a debate that rages on among beta testers and the Death Knight community at large. I don't mean whether the recent huge nerf to Death Knight damage was justified. Rather, the argument I'm talking about is over the clash of 2-handers and dual wielding. 2-handers have been the Death Knight weapon of choice in the modern era of the game up until recently. Frostmourne, the ultimate Death Knight weapon, is a massive two-handed claymore. In the early to middle part of the classic end game, Baron Rivendare was the Death Knight that loomed large in everyone's thoughts, and he too wielded a much coveted two-handed runeblade.
Because of this, many Death Knights have no plans to ever pick up 2 weapons. The massive bloody two-handed runeblade is the classic Death Knight emblem. It's part of the lore and the feel of the class and, they say, there's no reason to change it.. At the same time, many other Death Knights say that dual wielding is here to stay. New prominent Death Knights such as Lord Darion Morgraine dual wield. It's now part of the lore, and 2-handed lovers should just suck it up.
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The choice the devs tried out in the latest beta build is to nerf some of the key talents that make dual wielding scale better. Necrosis was nerfed from 25% extra damage to only 10% extra damage, while Blood Caked Blade now only does 20% weapon damage plus an extra 10% damage for each disease on the target. Unfortunately, this hasn't actually solved much. Since Necrosis still works off the exact same mechanic as before, it still scales better than 2-handers. As for Blood Caked Blade, well, it's pretty bad all around now, with wide reports of it coming dead last on almost every Death Knight's damage meters in a normal rotation. In other words, it's not even worth the 3 talent points now regardless of what your weapon preference may be. As far as solutions they have yet to try, the most obvious is probably upping the base weapon damage percentage of certain strikes. Since Death Knights only count main hand attack damage in their weapon damage strikes, 2 handed weapons jump far ahead in calculating those.
The problem is, it's just not far enough ahead. Plague Strike, for example, only does 30% of weapon damage at base. Bumping these instant strikes up would definitely be a boost to 2-handed weapon damage. But boosting instant weapon strikes brings up a whole new can of worms. There's some concern that boosting them far could make 2handers overpowered as compared to dual wielding, especially at lower levels. Adding more instant weapon strike damage could also push Death Knight burst damage into overpowered territory as well (Not that our burst damage is too amazing right now, according to some). So it's a delicate balancing act on that end as well. Still, instant damage strike boosting may have to come sooner or later to keep 2-handed weapons competitive.
Death Knights are hardly the only class to face such a problem. Most DPS Warriors go for dual wielding Fury these days for min-maxing purposes, with the odd 2-handed Arms Warriors mostly for Blood Frenzy. However, Ghostcrawler has made it clear that the devs want both keep equal, so that an individual Death Knight can choose either for PvP or PvE. But to that, they'll have to make some choices as to what to nerf or buff to obtain that equality.