Im finding the dual wielding is killer .. im killing guards with almost 3 hits.
Throw a magic missile then run and slaughter

But i think the confussion is in the item screen. because the hover over gives you the difference between what you have and the one your selecting which in dual wield is usless becuase it doesnt give you the stats for if you had both.
Just a suggestion, maybe for DD3 ..STAT CALC! Maybe a small button on the item screen that will pop up with the types of wield and give you a quick "if you do this you get that" sort of screen..
i dont know im not a dev .. but maybe theres something in that ^_^