Sadly daggers currently suck.
Spears have the juicy pole swings that your right swing looks similar to the stab, especially if you turn sideways or are spinning. So they then block middle and you get in a crappy side hit. And then they might think your doing it again and block the side and u can get a stab in.
MO1 daggers clapped because it was pretty easy to lag behind people and hit the min the back to get around middle blocks. This game you pretty much cant hit them if its 1v1.
Also MO1 had damage handles that made daggers better dps than spears. Also not in this game (I think)