With max haste. (100% Buff/worn + Bards: CoP)
You can get this down to 71/12.
Let alone add Innerflame Discipline.
No you can't dual wield if your using 2hb, but add some Ferocity mods, ex. Maxed out Ferocity AA, Ranger's 2 attack spell with mods (adds up to around 30% with both) Worn (Belt of black dragon).
So I wouldn't say this staff is completely useless. But godly only under the conditions I wrote above.
-Food for thought- ..