Duel wielding is much more effective than it was in D2:ED. A lower damage per second for bows doesn't matter too much if opponents can not get to you alive, though.
Once you are in the fjords (after the battle tower), check the smith in the harbour building to see what he has for bows.
The killer bunny can not climb or swim, so jumping onto a rock/platform or standing in water can make it an easy fight (though still slow, since you are probably not going to be doing damage very fast at low levels).
