The thing to be said about dual wielding in its defence is that its not all about straight damage calculations using 2 +3 longswords. The best reason to dual wield is the additional abilities of the 1 handed weapons. There is TONS of good 1h weapons in the game and wielding 2 at a time can really pile on the specials. I like to throw a weapon in my offhand that sorta fits the situation and I tend to run my best weapon in my mainhand. having a weapon in the offhand that gives say resistance to fear or something can make a huge diff in a fight if you know you are facing fear (dragons,symbol fear etc). This is where a 2handed sword has trouble keeping up. for some real fun try Celestial fury and flail of the ages (pixie prick works ok here too) and watch your enemy try to even make an attack
