Some help for a noob

[Warlock]

With good equipment, dual wield is better for autoattack damage than a two hander, but it has disadvantages.

The good:
- Your attack power counts for more. If you have 140 Attack Power, a two-hand user gets +10 damage per second; a dual wield user gets +10 damage per second on the main hand and +5 on the off hand. The higher miss rate counters this a bit but not completely - net is about 20% more damage per point of attack power you have.
- You get a second item to enchant
- Using Heroic Strike doesn't slow your rage generation as much (since you lose the rage generated by single main hand swing, not a single two handed swing)
- Using Heroic Strike is a little better than the numbers shown because it turns the attack into a special attack which does not have the miss rate penalty
- specials that depend on an attack critting or being dodged will be available more often

The bad:
- Special attacks that include weapon damage as a component will do less damage.
- Specials that apply for a given number of swings will do less damage.
- you generally get a few less total stats on two one handers than on a two hander of equivalent quality.