Both Single and Dual wield stats are so pointless to take over Scoundrel and Warfare.
Why would you take Warfare over Single or Dual Wield?
Scoundrel and Warfare give access to a ton of mobility, it's not about the stats at all. (which in all cases are minimal) There is an obvious issue with warfare being able to give you 100% crit and having access to huge damage skills as well as mobility. There is a whole other thread going over this topic in greater detail if you'd like to know more, but hopefully it will all be tuned a bit prior to launch.
On the original topic though, I feel as though daggers are supposed to have lower base damages that you increase through other means like scoundrel skills and backstab. The game is pretty openly heralding back to oldschool pen and papers where daggers did almost nothing for damage until you speced for them at which point they became monstrous.
Edit
Also worth noting that I'm currently in the middle of a DW dagger playthrough and enjoying it quite a bit. I have not felt underpowered at any point so far and I've played a lot of other builds to compare it to. I'll try to pay specific attention to how well I do in each encounter now that I have a reason to but so far my damage has been great.
