Can't speak for level 53 (I'm sure other will
[You must be logged in to view images. Log in or Register.]) but at level 41 my Staff of Battle was doing MUCH more dps than my Frostbringer + Lamentation. Also you get less riposte and damage shield damage... I don't know for high end, but for the mid-levels anyway dual wield is pretty much only for the procs and getting aggro... two-handed weapons felt better to
keep aggro and overall dps.